Pity the poor guy who hasn’t tried Super and EconoKote

If you're tired of the fuss, mess, bother and compound curved surfaces . . . and EconoKote’s hair-pulling you get from painting, now’s the time low cost is a real advantage, too. to switch. The next time you want a really great looking bird but want it faster, easier, stronger, o Trim Sheets and lighter, remember these winning ideas from Top Flite. & Markings With MonoKote self-sticking TRIM SHEETS and © Super MonoKote MARKINGS you can finish off your planes with There are a lot of good reasons more modelers all of the beautiful detail you want without count­ choose SUPER MONOKOTE than any other less hours of painting and masking. iron-on covering. Super Strong Yet Lightweight — Long Lasting — Fuel And Moisture Proof — o Irons & Heat Guns Puncture Resistant — Odorless — Won’t Induce For the best and most professional looking finish Warping — Quickly Cleaned — Built-in Finish — possible apply Super MonoKote and EconoKote And A Wide Selection Of Colors To Choose with a Top Flite IRON and HEAT GUN. Both From. work great on other heat sealing coverings, too. More good reasons why Top Flite continues to o EconoKote be the choice of champions. The perfect companion to Super MonoKote, ECONOKOTE has many of the same outstand­ ing features but, since it requires a lower iron-on temperature, it's the perfect covering for foam wings. EconoKote is an excellent trim material Top Flite Models, Inc. for any covering or finish. Its easy handling also 1901 N. Narragansett Avenue makes it ideal for covering fuselages and other Chicago, Illinois 6C539 c l'uiahn “Sl|l> Savige’'Train«». Three pon-cHul liltlc SIK\ ■ lirmlteU diul ready-fi>-Hv. p reefed y control our Ί miner.

Radio gear by Futaba is what makes these ck new ready-to-go flyers an instant isation. Our Futaba Trainer is designed Futaba gives you a choice of system/ Transmute» Receive» Servos Batte»y Puce rfectly for the novice pilot, pre-finished, plane outfits too. featuring a host of Tia»ne< 3FN R3f 3 S18 NiCad 42995 tembled and equipped with a gutsy K&B fine combinations. You might take a K&B 19 liking to our popular 2GS. throttle-controlled engine. And you Tiamc» 3S R3F 3-S18 Oy NiCad 37996 o get the one thing that's missing from or new single-stick, K&B 19 ery other RTF available...genuine three channel 3S taba electronics. Select our 3FN/Trainer systems matched Trainer 3S R3F 3S18 Dry 35995 mbo and you get three-channel, three up with an all-foam, K&B 19 •vo control with full NiCad power, plus Testors ,049/Piper Piper Cub 3S R3F 2S18 Dry 18995 ■ reliability and performance that has Cub. Testo» 049 tde us the leader in radio control. Boating's your thing? Pipe» Cub 2S18 Dry 159 96 Head out to sea with the Testo» 049 latest in pre-built speedboats / 60 2-S18 __ Futaba's electric Z-60, Mabucbi it's sure to make waves at the local pond. If vou're ready for radio control, then Freddy Futaba is ready for you. Futaba Futaba Industries, U.S.A. 630 W. Carob Street Compton, CA/90220 Semi-big fun scale Fokker DVII

Gentle and stable, a trainer that looks like an airplane with performance to suit the discriminating flyer. Quick build up KIT OL 781 Engines .60 - .80 Wing span 72" Wing area 1488 sq. in. See your dealer or· order direct Weight lO lbs. postpaid 4 channel radio required Kit features: 2 full size rolled plans (wing and fuselage) · Step by step Instruction manual with photographs · Quality die stamped balsa parts · Machine cut hardwood parts • Machine cut and pre-sanded plywood pdrts · Pre-formed balsa blocks · Pre-formed leading and trailing edges • Hedvy duty one piece ABS cowl · Pre-formed tending gear and cabines.

Accessories included: 5" scale wheels · Spandau machine guns · Scale pilot · Self adhesive decals Hardware package includes: Aluminium motor mounts • Pinned hinges · Snap-links · Control horns · Nylon bolts · Landing gedr straps · Socket head bolts and blind nuts. First in a series of vintage aircraft. Prototypes flew great with a K&B .61 and 14-4 prop. Dealer and distributor inquiries invited. Top Placing C on testan t

The results prove it! In the A.M .A.’s “Product eight used Futaba, seven used Information” book, 23 first World, and the rest used At the 1978 National place winners are listed in the assorted other makes. radio control section. Twelve of It’s obvious, Kraft is over­ Model Airplane these winners few with Kraft whelmingly the winner’s choice. R/C, three used Futaba, two Championships, There has to be a reason! contestants using used World, and the rest used assorted other makes. Kraft offers you more. Write for Kraft Radio Control our new free 1979 catalog, and The book also lists 112 top see for yourself. equipment swept the placing contestants. Forty-nine fie ld ! chose Kraft R/C, twenty-three 450 IV. California Ave. RAFT P.O. Box 1268 used Proline, ten used EK, - svsrtMs. *wc Vista. California 92083 » 0 14) 724-7146 s ■ \ CALTEX LUMBA-LUMBA

A STERLING CLASSIC

A SCALE BEAUTY ON THE SHELF OR IN THE WATER

Kit B-20M $41.95

Beam = 85/e"

Length = 38 V2"

For Gas or Electric motor TYPICAL HULL ASSEMBLY DESIGNED FOR R/C OPERATION

And what a pleasure to build! Completely pre-fabbed for easy assembly, this magnificent kit includes accurately die-cut Balsa and Plywood parts, specially carved parts, authentic decals, a molded plastic smoke stack and other plastic parts, full size drawings and simple-to-follow, step- by-step, illustrated instructions. The Lumba-Lumba is a natural for R/C equipment. The flat inner deck is fully 27" long and 7" wide providing loads of elbow room for the installation of any radio equipment. The single-unit superstructure runs the entire length of the ship and is instantly removable to get at her "innards”.

Catalog ol entire line ot airplane control line model hits R C scale STERLIN G MODELS · 3620 G ST PHILA PA 19134 and Trainer hits, boat model kits accessories, etc 50c enclosed If no dealer available direct orders accepted — with 10"- ■ additional Secrets of Model Airplane Building Including design, construction charge for handling and shipping (6 0 c m inim um in U S S1 25 covering finishing flying, adjusting control systems etc 25c minimum outside U S ) enclosed Secrets of Control Line and Carrier Flying Including preflight soloing stunting. Carrier rules and regulations. Carrier flying hints Name and control line installation instructions 25C enclosed No checks Only U S money orders or currency accepted A ddrpss .C ity .State Zip. j 2 MODEL BUILDER SiLKSPUN COVERiTE COSTS ONLY 58< PER SQ. FT Silkspun goes on balsa like no other price is S8.20 against S9.00. Silkspun all you need. But if an opaque finish is covering. Due to its unique “spun" also comes in a large roll: 38”x25 feet required, Silkspun needs only 1 /3rd construction. Silkspun partially melts a great size for the monster planes the amount of paint you would use on into the balsa. The result is an uncom­ and those long winged sailplanes. Both silk or tissue. By the way, Glaskote monly thin skin, permanently bonded, of these Silkspun sizes allow you to spreads so evenly, most modelers now which can be painted with great ease. cut out patterns with a minimum of brush it on rather than spray. waste. Try Silkspun. At 58^ per square foot, When properly applied. Silkspun vir­ On sailplanes, where a translucent finish it is surely one of the most economical tually eliminates the usual air bubble is popular, one coat of our Glaskote is coverings available. problem that occurs with non-porous plastic films. The proper way to apply Silkspun to a sheeted surface is lower the temperature of your iron to 275° (usually we recommend 350°). This is hot enough to liquify Coverite's ad­ hesive, but not hot enough to activate its shrinking action. Now you will be able to adhere Coverite to the balsa without air bubbles, and it will stick like the skin on a ballpark hot dog. Another tip for sheeted surfaces is always work from the center out to the edges. Don't start by tacking down the edges, as this will trap air. Finally, always allow the fabric to cool before going on to the next area. The best way to do this is rub a cold wet rag onto the just heated surface. This will force the adhesive into the wood and Here is the Runda Air Show Team, and here is hasten its curing process. what Art Johnson, team manager said in his letter: “VK triplane was covered with Super Coverite in As for cost. Silkspun is hard to beat. A 1971. . . and is still holding this bird together after regular size roll of Silkspun Coverite many hundreds o ffligh ts and plenty o f nose landings. (38"x54") contains 2052 square incites Our team members prefer Super Coverite for the almost 200 square inches more than open frame models and Silkspun for covering sheet

any of the plastic iron-ons. Yet list structures such as the Sig Kougars. ” THE COVERITE LINE PERM AGLOSS C O V E R IT E . I009J polyester iron-on covering. SILKSPU N C O V E R IT E . 1009Í spun polyester that looks like Prepainted. 3 8 "\4 3 "'4 3 "x 15 fect/5"x36"/ Red, white, blue, tissue. Unpainted. 38"x54” /38"x25 feet/ Red. white, blue, yellow, orange, aluminum, olive, dayglow orange, dayglow yellow, orange. yellow. black. BALSAR1TE. 1/2 pint cans of wood conditioner. SUPER C O V E R IT E . Same material as Permagloss, but not painted. 38"x47” /47"x 15 feet/ Red, white, blue,yellow orange GLASKOTE. 1/2 pint cans of clear, fuelproof, final coat. Pint and antique fabric. cans of th inner. Q U IK S TIK . 1/2 pint cans of iron-on adhesive. T R IM IT . Micro sharp knives for cutting all coverings.

420 Babylon Road.Horsham, Pennsylvania 19044 Coverite productsaredistributcd world-wide: Austria, Belgium, Canada, England, Irancc, Germany, Holland, Italy, Japan, Malaysia, Philippines, South Africa, Sweden, Switzerland, United States.

FEBRUARY 1979 3 OLDIES (BUT STILL GOODIES!) MOST BACK ISSUES OF "MODEL BUILDER" ARE STILL AVAILABLE, THOUGH SOME ARE IN SHORT SUPPLY. ORDER NOW, WHILE THEY LAST! PRICES VARY ACCORDING TO QUANTITY REMAINING IN STOCK. NOTE SPECIAL ANNIVERSARY PRICES LISTED BELOW!

November 1971 December 1971 January 1972 Nancy. R/C soarer. Curliss-Wnght Junior SHOCer F/F by Mel R/C Pattern World R/C 2" scale. Schmidt. Championships. R/C Twin Trainer White Trash, famous Peanut Fokker D V I. 75" span, for ,40's. R/C soarer. LSF Tournament story. Peanut Laird LC-DC. Peanut Ord-Hume. Bi-Prentice, R/C bipe Volksplane 3V-1 Chet Lanzo's famous trainer. 3-views. rubber Puss Moth. How to build light Curtiss Robin 3-views. "wire" wheels. Vol. 1, No. 2 $3.00 Vol. 1, No. 3 S2.00 Vol. 2. No. 4 $1.00

February 1972 Mar/April 1972 May 1972 Minnow U/C profile Yankee Gull R/C glider Seahorse II, R/C sea­ scale rac-, 8' to 12’ span. plane. For .19-.35. D.H. Humming Bird. Fokker E-1 ^ iC scale. Miss Cosmic Wind, QM Al Vela's O Boy 1/2A R/C Pylon racer. F/F or R/C pulse. E-Z Bo· <5 .A, Al Vela. Peanut Scale Sucker Peanut Fokker V-23. Peanu Q^-d Flivver. Jungmann. Whetstone 1/2A U/C Fibe ,^ sing over balsa, Siebel 1/4A F/F scale. combat. by Le Gray. Mr. Mulligan 3-views. Ryan ST 3-views. Spoiler, FAI Combat. FAI power "Folder." Tethered Cars, R/C sail.

Vol. 2, No. 5 $3.00 Vol. 2. No. 6 $1.00 Vol. 2, No. 7 $2.00

June 1972 July 1972 August 1972 Bob White Wakefield. Fairchild 51, 1" scale. Bonzo standr ' R/C Mongster QM biplane R/C or F/F. sport p v ^ ic a le . R/C pylon racer. SAM-5 A/2 Nordic. Counterf' O ailless Calif. Coaster R/C 1912 Avro G rubber. A/1 —. Jic. glider. Sheet wing. Comanche C stand-off Shoes' R/C QM. Three profile Peanuts. R/C scale. P e a r ^ aylorcraft on Deperdussin 3-views. Travelair 2000 2" scale m s , also big one. Pesco Special 3-views. R/C, by Editor. Fairey Delta 3-views. Chester Jeep 3-views.

Vol. 2, No. 8 $3.00 Vol. 2, No. 9 S4.00 Vol. 2, No. 10 54.00

Feb/March 1973 April 1973 May 1973

Profile F4U Corsair C/L Fabulous PEA POD, Bantee mini-pattern R/C stunt, .40 power. R/C sailboat. 3channel, .19 power. Beecroft's Satan, Class A Briegleb BG-12. scale Woodwind A/2, all sheet free flight. R/C soarer. covered wing. Indoor Ornithopter. R/C Spirit of St. Louis, Slope soaring technique. Peanut Travelair 2000 semi-scale, .049 .09- Teakettle, twin-boom PT-3 Scale Views. Peanut Volksplane CO2 pusher. Thermal hunting with Finish painting of rub­ Peanut Monocoupe 110. R/C gliders. ber scale models. Aerbo, .020 Replica, OT Vol. 3, No. 16 52.00 Vol. 3, No. 17 $3.00 Vol. 3. No. 18 $1.00 r ...... · · Apr. 75 2.00« I Put a check mark ( ) by the back issues you SPECIAL ! ! ! I May 75 3.001 ) wish to order. Magazines will be mailed by Sec­ Jun. 75 1.25« ) ond Class, postpaid. Foreign orders (except MODEL BUILDER MAGAZINE'S Jul. 75 · 1.25« I Canada, Mexico, FPO, APO) add 304 per copy. : 5th ANNIVERSARY BACK-ISSUE SALE !! \ Aug. 7502.00« ) Sap. 75 01.25« ) Allow about four weeks for delivery. If United \ ANY ISSUE MARKED WITH "o" 75 Cents! ; Oct. 75 01.25« ) Parcel Service (UPS) is desired, add 804 mini­ Nov. 75 01-25« I mum for up to two magazines, or add 804 plus •ANY ISSUE MARKED WITH " · " 50 Cents! j Dec. 75 01-25« I ]04 for each additional magazine on orders for three or more. Send check or Money Order (no k ...... λ Jan. 76 01-50« ) Feb. 7601.50« ) cash, please, and no COD’s). A facsimile of this Nov. 71 $3.001 ) May 7301.001 ) Apr. 7401.00« ) Mar. 76 01.50« I order form may be used. Dec. 71 2.001 ) Jul. 73 · 1.001 ) May 74 1.00« ) Apr. 7601.50« ) N am e:______Aug. 73*1.001 ) Jun. 7 4 · 1.00« ) Jun. 7601-50« ) Jen. 72 01-001 ) Sap. 73*1.001 ) Jul. 74 01.00« ) Feb, W 9.0 « > Jul. 76 01.50« ) Oct. 7 3 · 1.001 ) Aug. 7 4 · 1.00« ) Address:______M/A 7 2 · 1.001 ) Aug. 76 through Nov. 7301.001 ) S/O 74*1.00« ) June 7 8 ,1.50« ) May 72 2.001 ) Dec. 73*1.001 ) Nov. 7401.00« ) July 78 Sold Out C it y :______State:______Jun. 72 3.001 ) Dec. 74 01.00« ) Jul. 72 4.00( ) *Aug. 78 to date Jan. 74 01.00« ) Jan. 75 0 2.00« I F/M73 2.00( ) Fab. 74*1.001 ) 1 PLEASE PRINT ^ z i p : ______Fab. 75 2.00« ) Nov 78 Sold out Apr. 73 3.001 ) Mar. 7401.00« I Mar. 75 2.00« ) MODEL BUILDER, 621 West Nineteenth St., Costa Mesa, Ca. 92627 4 MODEL BUILDER FEBRUARY

MODEL 1979

BUILDER volume 9, number 85 621 West Nineteenth St., Costa Mesa, California 92627 Phone: (714) 645-8830

STAFF CONTENTS FEATURES EDITOR Wm. C. Northrop, )r. WORKBENCH, Bill Northrop...... 6 GENERAL MANAGER OVER THE COUNTER, Eloy M a re z ...... 7 Anita Northrop THE FLIGHT INSTRUCTOR, Dave Brown 11 EDITORIAL ASSISTANTS R/C WORLD, Bill Northrop...... 12 Phil Bernhardt R/C SCALE, Bob Underw ood...... 14 Eloy Marez R/C PYLON, Jim G ag er...... 22 ASSISTANT GENERAL MANAGER R/C FORUM, Hal deBolt . s ...... 25 Edie Downs CHANGING SERVO ROTATION, Eloy M a re z ...... 26 ART DEPARTMENT Chuck Blackburn LAS VEGAS T.O.C., Bill Northrop...... 28 Al Patterson MAMMOTH SCALE, Ron Shettler ...... 34 OFFICE STAFF MIDWEST’S "KLAMPON KAI", Jerry D u n lap ...... 37 Georgi Gilleran PLUG SPARKS, John Pond...... 40 Ron Hutto Pat Patton R/C SOARING, Dr. Larry Fogel...... 45 A. Valcarsel SAILPLANE DESIGN (PART II), Dave Thornburg...... 48 NORTHROP FLYING WING CONTEST, Eloy Marez 54 CONTRIBUTING EDITORS FUEL LINES, Aldrich, Klause, Bernhardt...... 60 George Aldrich Mitch Poling PUMPING THE WEBRA .91, Eloy M a re z...... 62 Dave Brown John Pond HALF-A SCENE, Larry Renger ...... 64 Otto Bernhardt Bob Preusse Rod Carr Fernando Ramos ELECTRIC POWER, Mitch Poling ...... 66 Hal deBolt Larry Renger MODEL MERCHANT’S “ PLANE JANE” , Charlie Viosca 68 Larry Fogel Dan Rutherford Jim Gager Ron Shettler STRICTLY SAIL, Rod C a r r ...... 70 Chuck Hallum Tom Hutchinson F/F SCALE, Fernando Ram os...... 72 Bill Hannan Dave Thornburg FREE FLIGHT, Tom Hutchinson...... 78 Joe Klause John Tucker Walt Mooney Bob Underwood HANNAN’S HANGAR, Bill H annan...... 82 CONTROL LINE, Dan R u th e rfo rd ...... 86 ADVERTISING REPRESENTATIVE W E S T : Bob Upton, 24431 Caracas SCALE VIEWS Dana Point, California 92629. CURTISS FLEDGLING (PART I), PeteWestburg 56

Subscriptions $20.00 per year. $37.00 for CONSTRUCTION two years. Single copies $2.00 Add $3.50 for postage per year outside of U S (ex­ GROSS VOGEL II, Charles Clemans...... 16 cept APO). OT SINGLE STICK PUSHER, Edsall/Patterson/Bernhardt ...... 44 Copyright 1979 by MODEL BUILDER Larry Renger Magazine. All rights reserved Reproduc­ THE CLIFFHANGER, ...... 51 tion without permission prohibited STORMHAWK, John Morrill ...... 74 Published monthly by MODEL BUILDER PEANUT DORNIER LIBELLE, Wall Mooney ...... 83 Magazine, 621 West Nineteenth S t . Costa Mesa. CA 92627 Phone (714) 645-8830 SHOESTRING/LITTLE MIKE, Jim & David O'Reilly...... 88 Change of address notices must be re ceived one month before date ol issue COVER: This 1/4-scale Pfalz Dllla was scratch-built from Wy lam scale-views by Bob that new address takes effect Send old Haight. Las Vegas, Nevada. Construction began in 1962 and was completed in 1969. address with new; old label preferred long before the current Mammoth Scale craze. Covered with Ceconite and finished Post Office will not forward copies unless with Stits silver undercoat, the 92-5/8" span ship weighs 22 lbs.. 10 oz.. and is you pay extra postage Duplicate issues powered by a Cox 1.4 engine converted to glow by Millet Eng., turning a Zinger 18 x6 cannot be sent prop. Kraft radio. Marcellina Ungaro, who is anything but "Pfalz", provides a stunning background for this photo, arranged and taken by Billy Root near Las Second Class postage paid at Costa Vegas. Mesa. California, and additional offices

FEBRUARY 1979 5 At the Las Vegas Tournament of Champions banquet, we were mighty proud to meet and rub elbows with Al Unser, Indianapolis winner, and first ever to win the Triple Crown 500's at Indianapolis, Ontaria, and Pocono, 1978. The main topic of our conversation had to do with the ways and means of controlling horsepower, a situation encountered in both of our sports. Photo by Dick Penrod. ť#»om ØM Northrop'* w o r k b e n c h · · ·

FLASH!! enterprise model publication magazine, Up until 1966, AMA published a news­ The FAI has just confirmed that the is not going to pick up and reproduce letter in various formats, much like its 1981 R/C Aerobatic World Cham­ every letter that AMA turns down, but parent organization, the NAA (National pionships will be held in Mexico. this one deserves the attention of AMA’s Aeronautic Association), has been pub­ The February 1979 issue of M.A.N. membership, and it is hoped that all lishing for many years. News to the contains the unedited reproduction of members will take this opportunity to membership is a requirement of AMA’s an open letter to the AMA Executive read it. constitution and by-laws, to keep in Council from David L. Peltz, Chats- As you read the letter, you will begin contact with members and inform them worth, California, regarding the latest to note that its main thrust is against of the organization's activities, rules, etc. dues increase. The letter will be found in Model Aviation, AMA’s model maga­ In 1966, feeling the need to cut news­ Walt Schroder’s Man At Work column. zine. For those of you who are relatively letter production costs, yet to expand its One reason that the letter appears in new AMA members and/or have only contact with the modeling public, AMA M.A.N. is that AMA refused to have it comé into the hobby in recent years, a made a private deal with American published in Model Aviation. Now little background on this matter may be Modeler magazine to publish AMA obviously, M.A.N., or any other private in order. news in a section of that magazine. Other equally qualified publications were not invited to bid on the job, nor even notified of the deal, until it was announced to the AMA membership and modeling public. Whether this idea for cutting costs was originated by AMA or by American Modeler is not known . . . part of the private deal. In 1975, American Aircraft Modeler (the change from AM to AAM occurred in 1968) went bankrupt (a management problem, and in spite of the obvious circulation and advertising advantages from being associated with the national organization). During the period that AMA was without membership communication and deciding its next step, this writer made a proposal. Obviously, making another private agreement with any single publication was out of the ques­ tion. We proposed that any magazine agreeing to publish the AMA news section on a monthly basis, at no charge to AMA, should be identified as an official AMA publication, and the mem­ bership could choose whichever one of these it wished at a special AMA rate. (If only one magazine accepted the offer, ",.. and thank you. Lord, for helping me to win the election for AMA President, and for giving at least no other publication could say it me the strength to listen to one more Texas joke ..." This absolutely classic photo was taken by Don Tremain, and first appeared in the Lincoln (Nebraska) Sky Knights newsletter, edited by hadn’t had the opportunity.) Majewski. Club will host the 1979 AMA Nationals. Continued on page 126 6 MODEL BUILDER OVER THE COUNTER

• Not too much in the way of news this month! Traditionally, this month is the time of year when manufacturers start holding back all their new goodies to introduce at the trade shows which will soon be upon us. And they are not as far away as you may think. As a matter of fact,about the time that you are reading this, the first show of the year, the International Modeler Show, will be taking place in Pasadena, the very first weekend of January. So, having some space available, I can answer some of the comments I receive from time to time. One being, believe it or not, that seldom does a picture of me appear in MB! So, in deference to For those of you who’ve been wondering what MB's Eloy Marez looks like, now you know. That's him in the rear seat of a two-place Cavalier Mustang. See text for more info. numerous (both) requests. I have de­ cided to open this month's column with longer canopy. Unseen mods included a And speaking of friends who com­ a picture of myself. Since I don't smoke, spar reinforcement, modern instru­ ment, write, or call, I have news of a it can’t be a portrait type with a cigarette, ments and radios, and a zero-time Rolls couple. Without any more pictures of as often seen. And the talking-on-the- Royce up front. Beautiful!!! myself.. . phone photos always remind me of the The bird shown was set up with one One is Bill’s Miniature Engines, in Petty Girls of years past. I dug around in pilot and an observer in the rear. We had Memphis. Well, it is no longer around! the archives and came up with one some a TF-51D model, with complete dual But wait a minute. Don’t run out and of you might enjoy. controls and instruments. The finish of sell all your Rossis. It has merely changed That’s me! In the back seat of the these birds was camouflage in the names, and is now known as Rossi Sales Cavalier Mustang, as remanufactured by shades used by the USAF during the last of America. The address is the same as Cavalier Aircraft of Sarasota. Florida, for years of Viet Nam, only in a higher gloss. before: 1325 Carol Dr.. Memphis, TN the "Fuerza Aerea Salvadorena” . the Air And for those of you who slept 38116. Force of El Salvador, with which I spent through your world geography classes, And Bill McGraw is still the man there, three enjoyable years as a USAF advisor. El Salvador is in Central America, be­ with phone number (901) 396-7485. So it won't be a complete loss of space, tween Guatemala and Nicaragua, on the The other is Windspiel Models, which I’ll tell you scale builders about the bird. Pacific coast. It is kinda small. . . in fact, it used to be in Idaho. Well, it is now in The modifications included an 11-inch is so small that the Mustang had to be California, at 1844 W. Glenoaks Blvd., addition to the fin, "hard points" under kept in a slight bank all the time, other­ Glendale. 91201. The number there is the wing for bombs and rockets, the wise you’d fly out of the country! (213) 241-5361. wing-mounted, nori-droppable tanks as When you call, be sure to tell them seen in the photo, two seats, and a where you got this good news. . . unless

New .60 engine from Fox, the Eagle It. Quarter scalers will like this one: the 1.2 cu. in. Fox Twin.

FEBRUARY 1979 7 7/32 at 98c each, all in 36-inch lengths. At your dealers or direct. Sig Mfg. Co.. Inc.. Montezuma, IA 50171. * * * [ |Q h b : e n g i n e s An interesting thing I’d like to know, but don’t: how many engines has Fox Manufacturing Co. produced in its lifetime? My first one that I can remem­ ber definitely was In a "Stunt Stuka” from Air Trails magazine, that I used to fly at Tachikawa Airbase in japan, be­ tween C-54 missions to Korea, in 1952. One thing is certain: there have been a lot of Fox engines produced since then, and Duke's crew in Fort Smith must surely have learned a lot about our means of propulsion. The latest an­ nouncements from there tell us about a Bavarian Precision Products' new HB .21 PDP. new Eagle II, which should be of interest to pattern fliers, due to its unusually high power output and durability. It features profile and stunt models. an unusually large connecting rod and The secret of its superior performance New Fox fuel tank, designed especially for is two baffles, so positioned that fuel is Slow Combat. rod bearing, and is available in both side and rear exhaust models. Weight is 17 held at the pickup point under both you forgot the time difference between ounces, with a bore of .906 and a stroke acceleration and deceleration. The you and them and you get someone out of .937. The Eagle II is to be priced at inboard baffle is flanged in such a way of bed at three in the morning! $125, and deliveries will start in january, that fuel is retained at the pickup point for several seconds, even in tight over­ * * * 1979. Also to be available at the same time is head maneuvers. Need BIG diameter piano wire for A 2-1/2-inch size will run your .36 landing gear or wing struts on that Duke’s new twin, of 1.2 cubic inch displacement. It is big, sturdy, and engine for over 5 minutes . . . at $9.95. new Mammoth Scaler? How about some The tank is now at or on the way to 5.56 mm? Or maybe some .2187-inch powerful, features a one-piece crank, steel connecting rods, 3 ball bearings, your dealer. Also check with him about stuff? dual carbs, Schneurle porting, and the engines, or write direct to Fox Would you rather have some 7/32? Manufacturing Company, 5305 Towson Something like this is certainly a neces­ removable prop stud. The Fox Twin will be supplied with a Ave., Fort Smith. AR 72901. Tell them sity for those bigger and heavier models where you read about these new now so popular. Well, it is now available firewall-type mount, and every engine will be test run and adjusted before products. from Sig Manufacturing Co., which * * * increases to 12. the number of sizes of delivery. A rear exhaust model will also highly-quality music wire available. The be available. The weight is 2-1/2 pounds, range is from .015, at 5

New from Stewart Scale Models, a fiberglass basic scale unlimited hydro hull and the different E .K . Logictrol's extra-powerful "X M " servo. cowlings that can be adapted to it.

8 MODEL BUILDER ports in the cylinder sleeve and a special instruction manual are included. channel in the crankcase, the result of Look for this new engine at your which is greatly increased fuel effi­ favorite hobby shop, or write for further ciency. Fresh fuel mixture is introduced information, being sure to mention MB in front of the piston baffle at the proper when you do. time, which accelerates the expulsion of As a side note, Bavarian Precision exhaust gases, increases power and rpm. Products is now making Award Certifi­ and saves fuel. cates available to all model groups This is one of the features of the new sponsoring competitive events. This is HB .21; others are double ball bearings, part of its efforts to support and encour­ Perry carb, and a crankcase with both age our hobby, and will permit the winner of a certificate to purchase his or Improved servo-actuated towhook, from E .K . beam and radial mounts. A muffler, Logictrol. wrench, needle valve extension, and her choice of an HB engine at a 40% discount off the current price. Contest Directors may make their requests for these certificates directly to Bavarian Precision Products, address as above. Φ * · Logictrol International Corp., better known to most of us as E.K. Logictrol, has a new addition to its list of R/C-related accessories. It is an improved version of its original servo-actuated glider tow- hook. This is a must for the competition flier who can’t afford a premature unhooking, and who must release at the most opportune time to catch the best air. The new hook, designated as the THR-2, is fail-safe and adjustable from outside the glider. It is now available and is priced at $4.98. A new husky servo has also been announced, big brother to the Logictrol SM, to be called the XM. It offers six If looking out the window doesn't tell you enough about the weather, get one of these compu­ terized weather stations from Heath Co. Does everything but whistle Dixie. Continued on page 125

For contest awards. Bavarian Precision Products is making available Nicely made carving tools from Harmen Company. these certificates, good for 40% off on HB engines.

FEBRUARY 1979 9 e * »* »·· λ » 11 28 26 16 66 ...... WORLD ...... R/C S O A R IN G ...... 45 LAS VEGAS T.O.C F U E L L I N E S ...... 60 ELECTRIC MODELPOWER MERCHANT'S "PLANE JANE" . 68 R/C FORUM ...... 25 R/C W ORLD R/C S ...... 12 C A L E ...... 14 R/C PYLO N ...... 22 PUMPING T H E W EBR A .91 62 M IDW EST'S "KLAM PO N KS A A ILP I LA " N ETH ...... 37 D E E C S L IG IF F N H ...... 48 A N G E R ...... 51 MAMMOTH S C A L E ...... 34 THE FLIGHT INSTRUCTOR CHANGING SERVO ROTATION GROSS VOGEL I I The famed teamher-and-son fat of Hans and Hanno Prettner, from Klagenfurt, Austria, with their Dalotel huge DM-165, a made clean sweep of thp Rth Annual I a« \/poa« Tournam ent of Phamninnc emrinn ahnwo all rom notitnrf in ottorw mioliftrinn m rl fir.·»! mimr! C/»« I

MODEL BUILDER INSTRUCTOR Conducted by DAVE BROWN 8534 Huddleston Or. Cincinnati, OH 45236

• This last month has been a hectic one angle becomes continually less as you per second, or a very dangerous condi­ around the Brown household, with the progress from root to tip to compensate tion will exist: the tip speed approaches frantic preparations for the Vegas for the different distances traveled by the sonic range, causing serious vibra­ Championships, but as this is being the root and tip. tions and flutters which in turn lead to written, the airplanes have been shipped Enough theory (WHEW! . . . typist- many other problems. Assuming a nom­ by motor home (motor home???) and wife), now let’s gel to the practical side of inal increase in rpm when the prop is we are packed to fly out in the morning. things. Keeping in mind that the prop unloaded in flight, the following is a list Come to think of it. I’ll probably end up charts are generally set up for sport type of maximum rpm on the ground for finishing the column on the airplane. I engines and that basically, diameter various prop diameters (in inches): hope Bill Northrop doesn’t read this too determines thrust and pitch determines DIAMETER RPM closely, as this means it’s being written speed, let’s try a few hypothetical cases. on the fourth and was due the first!!! 16...... 11.500 This month only brought two letters, If you have a sport .40 engine in a typical 15...... 12,500 one of which would require a book to sport .40 size airplane, the chart calls for 14...... 13.800 answer, but I did have one individual call a 10x6 prop, and this is probably your 13...... 15,000 (sorry, I can’t remember his name) with best bet. The same airplane with a 12...... 16,500 the suggestion that I do a column on Schnuerle .40 engine would probably fly 11...... 18,500 props and their effects on airplane best on a 10x5. giving you about the 10 ...... 20,500 performance, so I’ll give it a try. same speed but increased vertical per­ 9 ...... 23,000 Most manufacturers of propellers formance and quicker acceleration. The 8 ...... 26.500 and/or engines supply a recommended same engine in a smaller airplane would 7 ...... 30,500 prop size chart which will generally give probably fly better on a 9x6 or 9x7, which As you can see from this list, the you a good starting point. The sizes would increase the flying speed. Putting maximum rpm recommendations are, in recommended are for general purpose this same high-performance .40 into a most cases, well above any attainable use with common sport engines, but large airplane such as a Senior Falcon or speed, but problems can be encoun­ what if you have an oversize airplane, or a high-drag scale airplane which is tered with this on racing engines or very a little one, or a heavy one.orwhatever? intended to fly fairly slowly, you might large engines. The Las Vegas type air­ A little understood fact that few people try an 11x4. planes have taught many people this realize is that, for any given size engine, This brings up the next point, which is lesson, as a good .90 with a pipe will turn the most powerful ones usually require very important. The tip speed of the a 16x4 at about 12.000 rpm, which puts smaller props than your average sport propeller must be kept below 900 feet Continued on page 115 engine! The reason for this is that the peak of the horsepower curve is at the higher rpm, and it is necessary to allow the engine to turn up faster in order to take advantage of this horsepower increase. A perfect example of this is the fact that in the early '70’s, the most common prop used in pattern was the 11x8. with a good engine turning it at 11.000 rpm: in the mid '70's the most common propeller became the 11x7-1/2, with the engines turning at 12,000-12.500 rpm: and in the last two years, we have seen the 11x7 or 11x7-1/4 become more popular, with the engines turning at 14,000-15.000 rpm with a pipe. The first question we must discuss is what the propeller size designations mean. What is a 10x6 propeller, for example. A 10x6 prop is one with a diameter of 10 inches and a pitch angle which would pull the propeller forward 6 inches per revolution if it was used in a non-compressible substance, like but­ ter. Most propellers have what is called helical pitch, meaning that the pitch FEBRUARY 1979 11 This tranquil, winter scene was captured by Neil Whitman, Simsbury, Connecticut, and shows his son Tim's partially finished, electric powered Dumas "Shelly Foss" tugboat, pulling a tow through a skim of ice forming on their pond. Better hurry, Tim!

EWORLD By BILL NORTHROP WHAT’S A MODEL? importantly, the FAA officials, need to etc. This would eliminate even the Last month, in our “ W orkbench” have a clearly defined border line reasonably large size models which are column, we installed a flash regarding a between model aircraft and . . . w ell.. . now so rapidly gaining popularity. recent move on the part of AMA to non-model aircraft. The point is this; as counteract the runaway growth in the models become larger, whether R/C, We have discussed this with many physical size and weight of models. F/F, or C/L, but most obviously in R/C, leading modelers, and something in the Reacting to a supposedly serious (or very there has to be an established limit neighborhood of 30 pounds, 35 ounces facetious) question on the part of a beyond which AMA is no longer re­ per square foot, and 2 to 2-1/2 cubic member who asked if it was within the sponsible for the consequences of a inch total engine displacement usually general AMA rules to fly a full-size J-3 serious accident. In other words, if AMA gets the best reaction. One problem still Cub with radio control, the Executive has a 30 pound weight limit, and some­ seems to nag all of these discussions, Council invoked the FAI’s description of one builds a 35 pounder (you think it however . . . the matter of how much a model airplane. To repeat, “ An Aero- hasn't already happened?), AMA can horsepower can be developed from 2 to model is a heavier-than-air craft of say, “ Go right ahead and fly it, Sonny, 2-1/2 cubic inches. limited dimensions, with or without but you better get the FAA s approval, Without going into the various esti­ engine, not able to carry a human ’cause it’s not our baby!” mated possibilities for controlling being.” OK, so how do we "clearly define” or horsepower, and thus the potential While this takes care of any individ­ separate models from non-models? And speed and total collision force of aircraft ual’s attempts to fly a full-size aircraft by by the way, if “ we” don’t do it, the FAA with this power, we’ll offer the best radio control within the sanctity of will step in the first time there is an power-control suggestion we have AMA, it certainly does nothing to solve incident and do it for us. If the FAA does neard to date. It was made by Don Lowe, the much more realistic problem that is it, it would probably follow the example long-time competition flier, past R/C with us right now .. . The modelers, the of several European countries which Contest Board member, FAI R/C Team insurance companies (particularly have adopted the FAI limits; 11 plus Manager, RPV designer and flier, and AMA's), the manufacturers, and most pounds, .61 maximum displacement. currently District III Vice President. Don

The prototype Byron Originals P-51 making a realistic fly-by for Phil Kraft's Super Fli looks just a little over-propped with a Zinger spectators at the Las Vegas T.O .C. 24x8, installed by Tony Bonetti when Kraft wasn’t looking.

12 MODEL BUILDER suggests that we simply establish a carburetor intake cross-sectional maxi­ mum area. Within reasonable limits, it is virtually impossible to extract more than a certain amount of power from a spe­ cifically limited volume of fuel and air mixture. By using a simple no-go insert gauge, it would be relatively easy to measure and control this limit. In fact, Don feels that this limiting feature might be enough to take care of the whole model aircraft limitation. Though we heartily agree with the power limitation idea, we feel that the physical model aircraft size must still be considered, if for no other reason than the instant visual appraisal of the aircraft with respect to its model or non-model identity. We urgently request your feedback on this question, as time becomes more critical. Before modelers go beyond safe limits, before manufacturers invest too much time and money in products that might become illegal, before the FAA prescribes limits that we could not live The Dragonfly strikes again! Helen Randolph was one of 6 ladies out of 18 who successfully with, let's decide what’s a model... looped, turned left and right, from husband's verbal instructions at Dallas R/C Club Fall Picnic. DRAGONFLY STRIKES AGAIN Our very popular "Dragonfly”, fea­ tured in the February, 1976 issue, played a major role at the Dallas R/C Club’s Fall Picnic. Using the .15 powered model shown in the photo, 18 wives attempted to fly a loop, followed by a left and right turn, on verbal instructions only before handing over the transmitters to their husbands. Helen Randolph, in the photo taken by her husband Randy, was one of six ladies who succeeded. Photo was taken alter the contest. WATCH THAT GASOLINE! Charlie Reed, editor of the Kansas City Radio Control "Contacts” , published a timely reminder in the latest issue. He believes all model publications should stress the problems with gasoline in ignition powered model aircraft. Most of the fliers today (but not all, Charlie!) are not old enough to remember the crash-and-burns . . . yes, real fire . .. associated with theold gasoline engines. A major portion of the scale ships which appeared at Mile Square Park. Fountain Valley, Ca., for With the methanol and nitro of today's the Scale Squadron's 2nd Annual Non-Contest. Many Mammoth Scale aircraft in attendance. glow fuel, it’s almost impossible to have problems (try to tell that to Charlie Viosca!). Reed says you can throw a lighted match into an open container of glow fuel and it will either go out or burn with a low blue flame. (Frankly, we’re willing to take his word for it, and have no intention of verifying it. We also warn strongly against anyone else trying it!). Do the same thing with gasoline and you’re guaranteed an explosion. NAME FROM THE PAST The “ built-by” caption in one of our photos should cause a double-take among some of our old-timer type readers. We’re referring to the Flamingo framework photo. The builder is Bruce Lester, of Toronto, Canada, and if you were reading model mags back in the late 1930’s, the name should ring a bell. You’ll be reading more about him in a subsequent "Plug Sparks" column, so we won’t undermine ]ohn Pond’s efforts with more information at this point. Bruce Lester, Toronto, Ontario, Canada, is building this Udet Flamingo from scratch. Don't Once a modeler.... · worry, since taking the photo, he has added ailerons to the bottom wing. See text. FEBRUARY 1979 13 Beautiful action shot of Kirby Crawford's Curtiss Gutfhawk, recently flown at D.C. meet. Kirby did his own conversion on a Homelite chainsaw engine, does a good job of pulling the 27-pound model through a realistic aerobatic routine. Model is not quite 1/4 scale. Photo by John Preston.

5. Claus wife is pleased beyond reason with the North Pole, World $16,000 fur coat, however, my request 00001 for Monokote referred fo an entirely Dear Mr. Claus, different item. I felt it imperative that I write to you She was confused, however, to find concerning the gifts which were left at the older Italian gentleman who was Tom Stark with his Bird biplane at McDonnell our house this last Christmas. Please do sitting under the tree. If you check Douglas meet held in St. Louis. not misunderstand; I certainly appre­ carefully, I believe you'll discover that a ciate the generosity exhibited by you, Rossi 60 is an engine. I am relieved next year when I send my “ Dear Santa" however, there seems to be a rather beyond words that I didn't ask for a letter. signifigant communications gap be­ Super Tigre! Sincerely, tween our house and yours. Please allow Perhaps you could pick up a few of the joe Modeler me to clarify the requests that were items that could be used elsewhere. I’m BIG ONES REVISITED made in the original letter of December just finishing up two scale models and In one of the first efforts produced for 2, 1978. needed a couple of items, however, this column, some comments were It would appear that you misunder­ even though they're darling, I just can't made concerning "Big Ones” ; the large stood the meaning of the item listed as use those little sets of trousers. I had and super-large models. In the almost “ Kraft". I think our family will find it very something else in mind when I asked for one year since then, there has been a difficult to use up 450 jars of salad pants for a Chipmunk and a Minnow. tremendous movement in their direc­ dressing, not to mention the 38 lbs. of Also, I'm certain a Tibetan monk would tion. There has been a like amount of cheddar. make more use of the cowl you brought. “ press” , both positive and negative, I realize that the description “mono" Once again, thank you for your gen­ with claims and concerns from both means one, and I must admit that my erosity and I’ll try to be more specific points of view. The main thrust of many

John Preston took this photo of the flight line at D.C. meet. Didn't Bud Atkinson at McDonnell-Douglas meet with his Savoia Marchetti say whether photo was taken from a model or full-size plane. SM 79. Friends say he painted it by exploding a jar of mustard nearby. 14 MODEL BUILDER of the discussions has been aimed toward the concept of safety. My first article spoke to this point and this is the consideration here. While the "big” movement is not limited to scale by any means, much of the activity is addressed tothis. In light of this, I feel we must consider the many ramifications from a scale point of view. In addition, we must distinguish be­ tween “ big” models and quarter-scale. A quarter-scale model is not necessarily large. A Pitts, a Volksplane, and myriad others do not turn out "big” if prepared quarter-scale. What, then, is “ big” ? Before we address ourselves to this problem, let's consider the credit and debit columns that have developed from various sources. Good God! This sort-of-scale Avro Lancaster was demonstrated at the Scale World Champs at Woodvale, England. See text for Bob's comments on ultra-large models. CREDIT: Bigger models (ly belter and more C02-powered R/C model. breaking up due to the firmer stock realistically. While there are other "credits” that used. A generally accepted point that this may exist, let’s look at some “ debits”. Big models are " out flying" the available writer would agree to snare. An early DEBIT: equipment such as servos, etc. Bonzo flew like a lead Zeppelin at 2-1/2 The model may not hit harder in a crash, The industry has been very quickly inches to the foot, while at 3 inches but it covers a larger area. reacting to the needs of big ones, and (quarter-scale) it flew like a pussycat. Would seem to be true, especially if equipment such as servos keyed to the The reason, of course, was due to several you’re considering an attentive audi­ special needs are becoming available. It factors. The wing loading dropped ence at a big event. I can’t help but is questionable to consider using older, dramatically when the wing area jumped wonder if they are more resistant to from about 600 sq. in. to almost 900 sq. Continued on page 92 in., while the weight went from about 9- 3/4 to 10-3/4 lbs. While they weigh more, then fly slower: hence, they have no more destructive force than smaller models at higher speeds. Not having the scientific knowledge to field this, we’ll simply comment that there appears to be logic in that state­ ment. They use less expensive materials and fuels. Seems to be true, considering the ability to use something besides balsa and glow fuel. Other than making big models more attractive to build, there is not much to consider about safety here. They are easier to detail. Would seem to be true. No safety feature other than that they can stand detailing better without accumulating unrealistic wing loadings. They are more impressive and satisfying. No safety feature, and is simply a matter of opinion. One of the most impressive things I’ve seen is an indoor At the Texas Flying Scale Championships, held at Abilene, Texas, Robin McGeorge's Platt T-28 placed 1st, and Buddy Irwin's scratch-built Gloster Gladiator took 2nd. Jerry Farr photo.

Fred Hulen with his old, old scratch-built T-28 Good in-flight shot of Robin McGeorge's T -28 ,1st in Sport Scale at Texas Scale Champs. A at McDonnell-Douglas meet. beautiful model, but where the hell are the pilots? Photo by Jerry Farr.

FEBRUARY 1979 15 d?ff®88 ^®@©íl S S By CHARLES CLEM ANS . . . An improved version of the author's original design powered flying wing, the Gross Vogel is a real attention-getter. Article includes tips on how to lighten the model for power soaring. • Gross Vogel II is without doubt a aircraft is easily mistaken for a buzzard or pearance, requires care during ground strange sort of aircraft. How many nine- a hawk. Until, as Tom Richards put it, "I handling. The dihedral, which permits pound, .60-powered, tail-dragging, remembered that buzzards don't have hovering flight and hands-off cruise, non-swept flying wings have you seen square-tipped wings.” makes crosswind takeoff or landing lately? DESIGN SUMMARY difficult. Its unusual appearance and flight Function: Novelty sport and powered On initial flights, care should be taken characteristics have made GV II a popu­ soaring. to line up directly into the wind. The lar attraction at model airshow activities Configuration: Flying wing with zero rudder is quite effective, due to the in the Seattle area for several years. Its sweep and constant chord (PLANK propeller slipstream, and a rudder- flight envelope includes such outrages planform). induced skid with the corrective roll as STOL and hovering flight in moderate Area: 1774 square inches. induced by the dihedral can result in a wind, barrel and snap rolls, and hands- Span: 101-3/8 inches. ground loop if one wing touches the off flight at cruise altitude. Weight: 9 pounds with Kraft ground. With the engine idling, the aircraft 3-channel. On a pattern ship, ground tracking exhibits a very low sink rate, allowing Power: .45 to .60, an ancient Enya during rollout is accomplished with one to cruise for long periods searching .60 was used on the prototype. rudder and nose or tail wheel which, for thermals while using little fuel. The Controls: Rudder, elevator, and due to near-zero dihedral, results in yaw muffled engine makes little noise when throttle. only. With the Gross Vogel, the cor­ idling, and GV II has shared a thermal Airfoil: CJ-1. rective rudder required for a crosswind takeoff will invariably result in a skid and with a hawk on several occasions even FLIGHT CHARACTERISTICS though the engine was still ticking over. steep bank when the aircraft breaks Any aircraft design is a compromise, ground. The bottom of the wings and fuselage and the Gross Vogel is no exception. The Prior to the first flight, check the are black for maximum visibility from taildragger configuration, which re­ center of gravity. It should be 3-1/4 below. When circling in a thermal, the duces drag and gives a distinctive ap­ inches back from the leading edge of the wing, plus or minus 1/4 inch. An ac­ curate method of accomplishing this is to balance the model on the eraser end of two new pencils, one on either side of the fuselage. The pencils should be mounted in holes in a board or clamped in a vise. The fuel tank should be empty during this operation. The neutral position of the elevator should be set as indicated on the plans; it continues the reflex or upsweep of the airfoil. As stated earlier, make your initial takeoffs and landings into the wind. On about half throttle, takeoff is about the same as with a conventional aircraft, requiring from fifty to one hundred feet.

16 MODEL BUILDER After a run of thirty to forty feet, the tail will lift and the aircraft will accelerate and eventually lift off in a gentle climb. DESIGN EVOLUTION The basic configuration of the Gross Vogel originated with German designs of the late 1930’s, which featured a constant chord wing with no sweepback and a so-called self-stabilizing airfoil. The C)-1 airfoil was evolved from one used on theStruijkplank (ironing board), a Dutch design circa 1950. Prior to the development of the plank configuration, longitudinal stability in flying wings had been achieved by means of sweptback wings and washout (as much as 18 degrees) at the tip. The Good closeup shot of the engine and radio installation. Most of the top of the fuselage is remov­ swept configuration, while aesthetically able for access to the tank, radio, and control linkages. pleasing, has structural disadvantages. Pitch stability in the flying plank is achieved by the forward location of the center of gravity, 18% to 23% of the Mean Aerodynamic Chord (MAC), as compared to 30% to 50% on conven­ tional configurations, and by reflexing the trailing edge of the airfoil. Those interested in a more detailed treatment of the subject of plank stability and airfoil development are directed to |im Marske’s excellent book on the subject. In 1968.1 visited the Los Angeles area, where Dave Jones was flying a small slope glider utilizing the plank con­ figuration which he called the Wing Thing. I was intrigued by Wing Thing Control linkage details. Square brass tubes provide positive drive to elevators. Rudder pushrod because of its unusual appearance and exits the fuselage via a bellcrank, connects to tailwheel strut which drives the rudder. flight characteristics. It could turn on a dime, and when the wind wassteady.be made to hover just above the edge of the slope. Since that time, Dave and I have collaborated on several flying wing designs, including the Little Plank and Standard Plank, which were published. Anyone wishing flying wing design data, airfoils, etc., or plans for state-of-the-art flying wing sailplane designs such as the RAVEN, should drop Dave a line at Western Plan Service Upon returning to Seattle. I began designing what was to be the first Gross Vogel. Slope soaring had yet to be discovered in the northwest at that time, Prototype Gross Vogel uses an Enya .60, which is more than enough power. Engine is angled to and the aircraft was configured as a one side to provide clearance for muffler. powered sailplane, to be hand launched. The original GV was powered by a Cox aircraft weight grew from 4 pounds to ruggedized through extensive use of .09 pusher and required nearly a pound 6.5 pounds. Most of the time, Gross 3/32 sheet. The fuselage, formerly of of ballast to achieve a proper center of Vogel was flown on one-fourth to one- balsa, was changed to plywood to with­ gravity. Needless to say, the Gross Vogel half throttle. The increase in power was stand the weight and vibration of the did not remain a pusher for long. dictated by the desire to carry increas­ larger engine and occasional bad Like many designs one reads about, ingly larger payloads (camera, streamers, landings. Gross Vogel flew right off the board, but etc.), to perform short-field takeoffs, At full throttle and full up trim. Gross barely. The hand-carved pusher prop and climb swiftly to thermal country. Vogel will leap into the air in anywhere did not turn well and the Gross Vogel from five to twenty feet, depending on made one very low turn around the field The original Gross Vogel won first prize for novelty aircraft at the 1971 the wind. After the aircraft has gained before running out of air. It may very twenty to thirty feet of altitude, reduce well hold .the record for continuous RAMS symposium. It brought many hours of pleasure until its demise in the up elevator and/or reduce throttle flight iri ground effect by an aircraft with to achieve the desired climb angle. Due higher aspirations. While the first flight 1974. It had survived a major crash dueto radio failure and two attempts at free to the effect of the propeller slipstream was not impressive, it had demonstrated on theelevator.somedown elevator will that the design was extremely stable, flight (failure to switch on the radio), but finally succumbed to a case of battery be required to maintain level flight at even at very low speed with a minimum full power. of power. pack ejection brought on by faulty hatch design. Landings pose no special problem. As During the next five years, the aircraft Externally, there is little difference with takeoffs, landings should be made was flown with a variety of engines: Cox between Gross Vogel II and (heoriginal, into the wind. With no wind, there is a 15, McCoy 19, S.T. 35, and finally an Enya but internally this is not the case. Wing tendency to fly right off the far end of 45. A landing gear was added, and the construction has been simplified and the runway. Beautiful three-point land- FEBRUARY 1979 17 ings are possible if flair is begun at an altitude of about two feet, ending with full up at touchdown. Touch-and-go landings can be made with engine at low idle, but are difficult due to ground effect holding the aircraft off. SPECIAL MANEUVERS The propeller slipstream passing over the control surfaces provides good control response, even at very low airspeeds. In light wind (6 to 10 kts.), near-vertical ascent and descent and even hovering flight is possible. This flight mode is typified by high engine rpm, with angles of attack usually in excess of thirty degrees, and low relative airspeed. Head into the wind and grad­ ually increase up elevator and engine rpm until the desired relative ground- speed is achieved. Stability is maintained using rudder, elevator, and throttle. Vertical landings are possible if the wind is steady, but are not recom­ mended due to the turbulence usually found near the ground. The whole operation is a bit like balancing on a ball. With the aircraft trimmed properly, it will fly for extended periods without operator control. As noted earlier, the radio must be left turned on for this stunt. With the engine on idle, full up trim, and rudder set for lazy circles, set the transmitter on the ground and let KRAFT 3-C H the Gross Vogel hunt for thermals. This is not recommended at low altitude or at TANK high engine rpm. Remember, trans­ mitter range is reduced greatly when the transmitter is not hand-held! Extremely small inside loops are pos­ sible. Begin from level flight with full power and full up elevator, then cut power at the top of the loop to avoid excessive speed buildup. Remember, ENYA 60 WITH KRAFT with Gross Vogel the throttle is an active MOTOR MOUNT TILTED TO PROVIDE MUFFLER LANOING GEAR AND control element. Go fast and turn left is CLEARANCE HATCHES SECURED WITH 3/16 NYLON for the pylon types. Go to an airshow BOLTS sometime and listen to the way the engine is used to accomplish the various maneuvers while keeping airspeed and g-loads within bounds. Power-off loops require only a shallow dive to build up airspeed. A power-off loop can be entered with the speed built up doing a power-on loop. While axial rolls are not possible with the Gross Vogel, some really astounding barrel rolls and snap rolls can be per­ formed. Inverted flight is possible but difficult, due to the reflexea flat-bottom airfoil. CONSTRUCTION The construction depicted by the plans is quite rugged, having been designed to withstand the rigorsof sport flying and occasional bad landings. If your primary goal is powered soaring, one or more of the following changes can be made for a weight reduction of from 30% to 50%: A) Use 1/16 sheet balsa in place of the 3/32 specified for wing planking. B) Build the fuselage sides from 1/4- inch balsa instead of plywood. Use 1/16 ply doublers where the wing spars enter the fuselage and in the forward equip­ ment bay. Another alternative is 1/8 ply If Gross Vogel doesn't result in a rash of UFO reports in your area, nothing will! mahogany door skins available from 18 MODEL BUILDER 1 /8 PLY EPOXY NUT TO BOTTOM KLETT

1 /4 BALSA

THROW ±7/8

1/4 PLY INSERT

ALLIGNMENT PIN ι/ β OIA X 4 S T E E L I I/4 DIA.

TAKEOFF AND LAND INTO THE WIND

IRE EEN

WEIGHT 9 LBS. SHEET 1 -3 SPAN lOf 3 /6 A R E A 1774

DESIGNED ( DRAWN BY

C CLEMANS MODEL BUILDER mmgmxinm BíiO SB V O SI JJ Plan No: 17&LÍ.4L- FULL SIZE PLANS AVAILABLE - SEE PAGE 128

your local lumber yard. Try Sig Lite Ply. permit insertion of the rudder tiller I fighter aircraft. C) Eliminate the landing gear and tail during final assembly. Mount the fin in a slot on the fuselage wheel. Add a balsa lower cowling and top, or butt glue using 1/8-inch diam­ skid. Exit the rudder pushrod from the FUSELAGE eter dowels to reinforce the glue joint. top of the fuselage. Raise the wing Cut the fuselage components using Drill the 3/32-inch diameter hole sufficiently to permit a good grip on the the patterns provided on the plans. through the fuselage just aft of the fin for fuselage for hand launch. Construct the basic fuselage box using a the tail wheel and rudder tiller assembly. D) Power with a .19 to .45 displace­ good grade of glue, such as Titebond, CENTER SPAR BOX ment engine, depending on the rate of adjusting bulkhead locations tosuit your Construct the center spar boxes from climb desired. Reduce fuel tanksizeand equipment. Install the triangular rein­ 1/8 square spruce and 1/8 birch ply­ move equipment forward to balance. forcing where specified. These are Lengthen nose from one to two inches required because of the small gluing wood. Cut the components to length and glue and wrap with silk thread, using for smaller engines. surface provided by the edge of the plywood fuselage sides. Cut the upper a length of aluminum spar as a male jig. I RUDDER/FIN deck and hatch blocks to profile and find it faster to build one long box and Construct the rudder and fin from soft install, using glue and nylon bolts where cut it to length after the glue has cured. balsa to control weight aft of the center appropriate. Use a slow-drying epoxy, as 5-minute of gravity. Cover with a paintable ma­ Carve and sand the fuselage to shape. epoxy will not provide sufficient terial of your choice, such as silkspan or Remove the hatch blocks and hollow to strength. Slide the spar out of the box Coverite, and set aside. Hinges may be suit. Fit the canopy at this time. One of before the glue sets up! fitted at this time if they are of the the early Gross Vogel variations was an If suitable aluminum (6063-T6 or removable pin type, such as Klett, to open cockpit, reminiscent of World War Continued on page 97 FEBRUARY 1979 19 FULL SIZE PLANS AVAILABLE - SEE PAGE 128 MODEL BUILDER FEBR U A RY 1979 FULL SIZE PLANS AVAILABLE - SEE PAGE 128 At '78 NMPRA Q-M Nats, 1st place winner Gail Jacobson (right) and Gail Jacobson reveals the secret to winning: when things start to caller Dave Latsha show off the goodies and Gail's Prather Toni. get out of hand in the middle of a heat, just close your eyes! PYLON By JIM GAGER Ě U Ě * H L O f t f

PHOTOS BY AUTHOR UNLESS NOTED

• “ Disqualification: Exclusion. Contest­ ants may be disqualified or excluded from any or all events if guilty of an infraction of contest rules, unsports­ manlike or discourteous conduct, in­ fraction of good safety practice or procedure, or conduct detrimental to the well being of model aviation. If, after entry in an event, a contestant is found ineligible to compete in that event, all of the contestant’s flights in that event are to be cancelled and any awards won in that event returned. If judged guilty of willful misconduct, the contestant shall lose all claim to awards, and shall be liable to expulsion from the contest site. Repeated or particularly vicious acts of Good start in 3rd heat elimination round in Doolittle races. All for nothing, though. Bob willful misconduct may result in suspen­ Reuther crashed and Ron Bressler and Al Grove both got double cuts. sion or revocation of the model flyer's sporting license.. has brought the strongest reaction of which prompted the writing of that Taken from the AMA Official Model any subject this writer has ever touched October column. Aircraft Regulations 1978/79 rulebook, on. Newsletters have picked up on the Quoting QM-NMPRA President Gail page 4, section 17. Rather than take up theme; phone calls from people who Jacobson in the October NMPRA news­ more space with the rest of the rule, look have experienced similar situations, and letter: “ . . . .1 think it is time that the it up. The most important part has been personal contacts while at contests lead CD's warn the contestants at the pilots’ shown here. me to believe that most pylon racers feel meeting and eject . . . anyone with any Our October issue column dealing it’s time to bring a halt to such detri­ unsportsmanlike conduct; any trace is with contestant misbehavior and treat­ mental temper tantrums and outpour­ sufficient! About the time a couple of ment of officials conducting a contest ings of obscene verbal abuse, the likes of the super-hots get kicked out, the

Before starting the first round, starter Ed Tasman made sure every Good start. All callers must have been watching the starter . . . flier and caller understood the rules and procedures. for a change!

22 MODEL BUILDER Gail Jacobson (foreground) and Doug Brueshaber ready for fly-off to determine the NMPR A Q-M champ. Gail flew a Cox-powered Toni, Doug flew a Shark, also powered by Cox.

Last picture ever taken of Bob Reuther's Cosmic Wind. See text for sad story. situation will correct itself.” I’m personally in full agreement with Gail and all the others who feel the same way. I, as a CD, fully intend to enforce sportsmanlike conduct at any contest I And they're off! Start of fly-off race between Jacobson and Brueshaber. Jacobson's plane on direct, and further, to back up fully any right. other CD at any contest I attend. The AMA (ourselves) has given us the tool to margin, forty-nine contestants came bring about the dignity which racing from 12 states, some as far away as New deserves, and now we must strengthen York and Oklahoma, to see who was the our backbones to enforce said rules. If best. They came not only to race, but to you’re not a CD, the problem still enjoy the easygoing hospitality that has concerns you as a contestant, contest become legendary in just a few years, worker, or club member, as the first time and to enjoy the superb vacationing someone enforces this rule, the CD is facilities this park offers. If one arrives going to need all the moral and possibly early enough, or stays over after the physical support he can muster. Let’s all racing, he can enjoy some fine fishing, try to make the 79 racing season free of boating, swimming, or water skiing on such incidents. the 4,860-acre Rough River Lake. Horse­ TIP OF THE MONTH back riding, golf, and hiking trails are We were introduced to this little trick other diversions to help one get "up” while at the 78 Rough River Races and for the coming races or unwind from the can attest to its usefulness. We didn’t chores of winning. Food, service, and think to put it in this column until a t t M E S the traditional warmth of the South all we recently saw it printed in the Ohio serve to make this one of the finest Gail Jacobson (right) leads Doug Brueshaber contests you could possibly attend. Pylon Racing Assoc, newsletter, edited around course for 1st place. by Art Arro. The association of clubs that sponsors “ Cyanoacrylate glues (Hot Stuff, Zap, the props with 400 to 600 grit (sand­ Rough River have invested heavily in etc.) used as a finish sealer on props. paper), followed by 0000 steel wool equipment from what little profits a race After your F-l and Q-M props are for a super finish. You can also wax the makes to allow this annual contest to finish sanded and balanced, just apply a props, and rubbing them with a kitchen become one of the better-run ones. The coat of cyanoacrylate, smoothing it out variety waxpaper works fine!” 1978 race was better than ever, with with a sacrificial finger. I generally use an 1978 NMPRA Q-M NATIONALS, few hassles and a smoothly-run two adhesive near the end of its shelf-life ROUGH RIVER. KENTUCKY,Sept. 9&10 days. If I sound redundant, it's because and don’t trust it for building anymore. Outdrawing the AMA Nats held in it's so nice to be impressed. After the cyanoacrylate cooks off, sand Louisiana this year by better than a 2-1 This championship race is actually two

Identification of planes for Doolittle final heat. Left to right: Doug Brueshaber (Shark), LeRoy Bobby Blouch (background) leads Doug Brues­ Webb (Toni), and Bobby Blouch (P-5I). Blouch was the eventual winner. haber around course. Webb dropped out. FEBRUARY 1979 23 From I to r, Lynn Stevens, 1977 Doolittle winner, helps Shorty NMPRA Q-M champs, I to r: Gail Jacobson, 1st; Doug Brueshaber, Holsclaw present new trophy to 1978 winner Bobby Blouch. 2nd; Bob Reuther, 3rd; LeRoy Webb, 4th. your time got bumped by one slightly lower, is almost unbearable. Early morning fog prevented racing from starting until 10 a.m. on Saturday, but then things flowed well and three- and-one-half rounds were flown. The high humidity and temperature caused all fliers problems in searching for that elusive needle setting, most fliers claim­ ing to be down 1000-1500 rpm from normal expectations. After the racing was over on Sunday, Bobby Blouch, who turned the fastest time of the two days, was overheard to say he had to go all tne way up to a .024-inch head clearance to get his Cox to turn up properly. At the end of racing on Saturday, it was too early to pick an eventual winner,as there was a five-way tie in perfect points for first and a four-way tie with fliers only one point down. Qualifying times for the Doolittle race cut-off were up around 1:38. Some of the sponsors who helped make the Sunday was a carbon copy weather- Rough River meet as good as it was. Beautiful new Doolittle perpetual trophy. wise, but the contestants had done their Well worth the effort to win. homework and times dropped slightly. making a total of thirteen qualifiers. In Gradually, through Sunday, the com­ order to run even-matrix three-plane races in one. The regular rounds of petitive racing took its toll of the contes­ heats, it was necessary to have a fly-off to racing determine who wins by totaling tants tied for first, with it finally boiling eliminate one qualifier. points, just as in most every other pylon down to a tie in points between Gail First elimination race was yours truly, race, the winners taking home beautiful Jacobson, from Georgia, and Doug Wayne Yeager, and Al Schwartz. silverware trophies and cash for 1st Brueshaber, of Minnesota. Schwartz came in last with a time of 1:47, through 5th places. M eanwhile, the The final fly-off heat to determine the Gager and Yeager both being in the mid twelve fastest fliers qualify for the Jimmy NMPRA Q-M Champ was somewhat 1:30’s. Then LeRoy Webb and Ron Doolittle fly-off, the winning of which anti-climactic, with Jacobson pulling Bressler flew their elimination heat and will get your name on a very beautiful away to a comfortable lead and holding only needed to beat Schwartz’s time to perpetual trophy and a $100.00 cash it for the ten laps, to be crowned qualify, which they both did. prize. The excitement and tension champion. In the first true elim ination heat created by turning a low time and Meanwhile, cut-off times for the between Phil Spies, Bobby Blouch and making the magic twelve, and then Doolittle Trophy dash had dropped to LeRoy Webb, Spies cut out in the early watching every heat and waitingtoseeif 1:35 with five fliers tied with that time, Continued on page 104

First five place trophies for Q-M championships, plus old perpetual Saturday night banquet at the Park Dept, facility. Great food and Doolittle loving cup (now retired) in center. short speeches . . . what more could you ask for? 24 MODEL BUILDER Lead-Acid cells are another type of that are traveling around the earth. battery often used by modelers. Most Outside of tapping a utility company often, these are used in conjunction outlet, the Ni-Cd is probably our most with the engine and starting. Most usable and reliable power source. The common today is the motorcycle type, a design criteria used in its development 12-volt battery used to power starters, created a supply which fills most any etc. The lead-acid cell is rechargeable. need very well. The Ni-Cd comes in two This type creates 2 volts per cell, thus a forms: a so-called dry and sealed type, R/C * / 12-voit battery has 6 cells. Sometimes a which is most common, and the “ wet single lead-acid cell is used for heating cell·', which provides a bit better per­ FORUM with the glow plug, however, in this case formance while adding the problem of some means of reducing the voltage has using a liquid. Model equipment gen­ to be incorporated. Most glow plugs are erally uses the sealed cell type, as its Hal deBolt only rated at 1-1/2 volts. So-called performance is more than adequate. P.O. Box 147 “ Power Panels” are offered by the Physically, the advantage of a Ni-Cd is Buffalo, N.Y. 14225 industry which use a 12-volt battery as a its compact size and light weight . . . power source and serve to provide the much more so than any other style Mail in your questions or concerns. various voltages (and checks and tests) battery in general use. Thus, it is great for needed to operate our models. model use. Electronically, it has even • Thismonih we have some letlers which greater advantages. While the voltage seem interesting to all R/C’ers. with the The major shortcoming of a lead-acid cell is the acid used in its operation. This created is only 1.2 volts, this battery will main subject being batteries. It is realized hold this voltage over practically the that the experienced R/C people under­ acid secretes fumes which must be vented form the batteries, and these entire range of its capacity; the other stand batteries well enough to get along types will not. This voltage stability adds fine, but you would be surprised how fumes are corrosive.. . just the thing not needed around model equipment. The greatly to the reliability of any equip­ little is known by the newcomers, and the ment powered by Ni-Cds. The only problems they get into as a result. Also, other objection is weight; construction being lead and liquid, they are heavy. detriment would be that it is a mechani­ from some of the advice handed out by cal device which contains some con­ the more experienced, it appears that Gel-Cells are a recent improvement of the lead-acid battery. The Gel-Cell is nections, etc., which are difficult to they may have been misled by some of manufacture and maintain in usage. On the more technical info that has been said to provide some improved per­ formance, while eliminating the fume a rare occasion, a Ni-Cd can fail for no published. Perhaps we can be of some apparent reason. While we might not help by offering some very basic infor­ problem. The difference between the two, as far as modelers are concerned, is like the result of such a failure, we mation without getting technical about should not get too excited about it, it. that the Gel-Cell uses a gelatin-like acid which is not liquid, and thus the battery considering all the advantages that the TYPES OF BATTERIES can be sealed and the fume danger battery gives us. USED BY MODELERS removed. Ni-Cd batteries vary a bit in con­ Dry batteries are lead-zinc cells, It should be noted that all lead-acid struction, due to the widespread use of normally associated with flashlights, etc. type batteries have a discharge charac­ them for purposes where performance They are a non-rechargeable type. When teristic similar to dry batteries. That is, is not critical. This change in construc­ they are freshly manufactured, they they have their maximum capacity when tion and/or manufacture is reflected in have their maximum capacity, and this freshly charged, and this capacity dimin­ cost. The most reliable types do cost a bit capacity is constantly diminishing as ishes whether the battery is stored or more. With our models, the charac­ they age. The decrease from storage is used. The rate, however, is much less teristics most needed are reliability and relatively small for a number of months, than with the dry type. vibration immunity. Most of our R/C then it becomes serious. In usage, every Nickel-cadmium batteries can be said manufacturers provide the more costly time the battery is tapped, some of the to be a development of the space age, Ni-Cd, which fills these needs in the best capacity is used and cannot be replaced. where the need for a lightweight and possible manner. In other words, R/C When proper engineering is used and a powerful energy supply was most im­ Ni-Cds are different from the types dry battery is called for. the size recom­ portant. That they have fulfilled the generally offered by the discount mended will be much greater in capacity need is easily observed; just recall the houses. than would normally be needed. In this trips to the moon and the many satellites Continued on page 112 way, the diminishing capacity can be allowed for. The most common useof dry batteries at this time in modeling is with some of the least expensive R/C systems; calling for dry batteries is one way to keep the initial cost down for the equipment. In many cases, equipment delivered for use with dry batteries can be converted to Ni-Cd operation (rechargeable). However, sucha conversion should only be attempted if the manufacturer re­ commends it; reason being that while dry batteries create 1-1/2 volts per cell. Ni-Cds have only 1.2 volts per cell. With most of the power supplies containing a number of cells, you ran see how this shortage of voltage can accumulate. Usually you add the voltage per cell to get the power supply output. Losing over 1/4 volt per cell can make a big difference when a number of cells are involved. So, do be sure that the lower voltage supplied by a Ni-Cd power supply will not affect the performance of the equipment involved. FEBRUARY 1979 25 The first step (after reading the instructions through) in reversing servo rotation is to disassemble the case. Shown above are three miscellaneous servos showing the screws to remove. From left to right, MRC, Ace Bantam, and Kraft KPS-14. js) Changing Servo Rotation By ELO Y MAREZ . . . Have you ever wished, while installing a radio, that one or more of your servos worked in the opposite diection? If so, this article is for you. It's easier than you might think. • Backwards is best! No, this is not a service managers of the radio compa­ a letter saying, "It was this way when I sequel to Stu Richmond’s October 1976 nies, who prefer that the untrained stay bought it," and insisting that it be fixed article in Radio Control Modeler about out of the systems which the company is under a warranty that expired last year. the advantages of Mode One flying. I responsibleto maintain. And rightly so; I You aren’t fooling anyone. Remember happen to agree with him, but that has too have seen some of the horrible that most R/C systems are assembled by nothing to do with this writing. I am examples of what people can do to their people who have made that type of referring to the fact that now and then, R/C systems with crowbars and blow­ work their career. A solder connection the installation of an R/C system and its torches. Worse, sometimes it was done made by a person who has done the related linkages would be so much by a well-meaning friend whose total same thing thousands of times is as easier, and better, if servo rotation was electronic experience consists of check­ different from inexperienced work as an backwards, or opposite to what it is. ing TV tubes down at the corner airplane built by a modeler of ten years’ Described here are simple instructions drugstore. experience is different from a first on how to reverse servo rotation. To compound the problem, quite attempt. The trained eye can tell imme­ This is not going to endear me to the often these butcher jobs will come with diately if amateurish work has been attempted. Thus, if you work on your radio, be prepared to assume the responsibility if something goes wrong because of your work. If the system is still under warranty, remember that most manufacturer’s warranties are voided if anyone other than themselves or their service centers work on their systems. So much for the not-quite-honest, and the not-too-skillful. On the other hand, it must be recognized that there are thousands of modelers in the world who are quite skilled, can and will follow instructions, and who can solder as well as any of the assembly pros. This is intended for you . . . for those times when, for one reason or another, you wish to reverse the direction in which one or more of your servos will operate. It is extremely simple, and one time around will make you an expert. Wish we could say the same for pylon racing! You will have to disassemble the case enough to reveal the motor and feed­ back pot assembly, change four solder connections, and re-center. That is all there is to it! The disassembly procedure will de­ Ace Bantam servo, less case, showing standard set-up. Gear train at the top, amplifier and motor pend on the exact type of servo. Some, at the bottom, and feedback pot between gear train and amplifier. like the D&R Bantam, are held together 26 MODEL BUILDER a heating element (32K535), tip adapter With the system power turned on, (32K100), and a .054 Micro Spade tip both receiver and transmitter, note the (32KPL340) that is ideal for this type of direction of servo travel versus stick work. The total cost is only $10.90, and travel. For example, does left stick make you can order other tips or heating the servo rotate clockwise, or counter elements for heavier work. clockwise? I would also recommend you get a roll Now, with the pot screws loosened as described, and with the system still live, with four small screws through the side of Ungar Super Wick, (32K5004), at $2.40. This is a resin-impregnated metal desol­ rotate the pot element with the needle- and come apart in two vertical halves. nose pliers. Note the direction of output Others have screws on the top or bot­ dering braid which is held against the soldered joint as the iron is applied. arm rotation versus pot rotation; i.e., tom, and can be partially taken apart to does the output arm travel with the pot, expose the electronics in the bottom When the solder melts, it will be wicked off into the braid, leaving the parts or opposite to the pot? Remember this, while keeping the top gear section as it determines which way you will turn intact. In any event, keep the gear train clean, tinned, and ready fora new solder joint. the pot to obtain servo re-centering together; it is not necessary to break it after the reversal of rotation. After the down for this rotation change. With The other thing to check now is the changes to be described are made, this most servos, the gear train is somewhat method we will use to re-center the movement will work in reverse. separate from the case exterior and is servo once the direction of travel has At all times, when the system is live, designed to remain as a unit without the been reversed, as it will be off a consid­ and you are working with the servo exterior of the servo being fully erable amount. Looking at the pot open, be extremely careful that you do assembled. element, you will see that is has some not allow the am plifier to come in Once you have the electronics ex­ indentations in two or four places along contact with either the motor or the posed, you will note three separate its perimeter. It is held in place with two needlenose pliers. To do so may cause a parts. There is the motor, easily identifi­ screws along the outside edge, which short circuit which may damage the amp able; the amplifier, which is the printed can be loosened half a turn or so, beyond repair. circuit board with all the components allowing the element to rotate in its During this operation, servo action mounted on it; and the feedback pot, holder. By inserting the tip ends of a pair can best be observed if the longest arm which is the round element usually sub­ of small needlenose pliers into the furnished is installed parallel with the mounted in a molded cavity in the indentations along the edge of the pot, it servo sides. A wheel or triangular device plastic gear train base. The wiper, which can be easily rotated. Continued on page 110 changes the effective resistance of the pot, is mounted on the output gear shaft and turns with the output gear. It is not visible until the pot element is removed. Note that the motor will have two, and sometimes three wires connected to it. If present, the third wire will go to the motor case, and will remain where it is. There may also be a resistor or capacitor soldered across the motor terminals. It is there to suppress electrical motor noise, and will also remain as is. The two other wires, also going to the motor input, are the drive voltage connections, and they will be removed and reversed from one connection to the other. Now, look at the feedback pot. It will also have three connections. One is the center tap, and is identified by an arrow, or is placed at the high point of a triangle. This connection remains in place. The other two wires going to the outside terminals will be reversed. Before you start unsoldering, there are a couple of things we need to do. One is to put away that radiator-fixing soldering iron and obtain a small one of not more than 30 watts, with a small tip. If you don’t have this type of iron and are looking for one to purchase, I would recommend a look in the Ace R/C After the four wires have been reversed, the servo will have to be re-centered. Needlenose catalog. It lists an Ungar handle (32K776), pliers are used to rotate the feedback pot until the servo output arm is centered. FEBRUARY 1979 27 First official flight of the first day, and some said, "He has it sewed At practically the same spot as photo at left. Bill Bennett, winner up already!" And they were right. The winner, Austria's Hanno Prettner. Hanno, Sue Kepler, "Miss T.O .C. 1978," and Walt Schroder.

,x .· . . Ar... by BILL NORTHROP *

• Way back in the December 1967 issue of Μ. A.N., the radio control news editor (guess who . .. the initials were W.C.N.), who continuously, to the point of bore­ dom, pushed the use of look-like-real model aircraft in competition of all types, was quoted as saying . . . “ Strange­ ly enough, it has taken a completely new event, NMPRA/AMA Goodyear (For­ mula I) racing, to successfully boost an aspect of competitive R/C flying that we’ve been trying, without results, to push (like we said) for years. We’re referring to the use of scale in competi­ tion, not for the primary consideration as in the Scale event, but as a bonus stimulation in stunt pattern that has enough teeth in it to make the effort worthwhile.. . “ Speaking of the Scale event itself, the complicated regulations on proof of scale, the myriad variations of bonus points for operating knick-knacks, the many special specifications for ground The top five (I to r): Wolfgang Matt, Liechtenstein, 5th; Dean Koger, USA,4th; Ivan Kristensen, handling of differnet types... discour- Canada, 3rd; Dave Brown, USA, 2nd; and Hanno Prettner, Austria, 1st.

Dave Brown, own Zlin 50-L, O.S. .90 FSR , Ivan Kristensen, own CAP 10b, Webra .91, Dean Koger checks aileron in Laser 200, Top Flite 14x6, Monokote, W.E. Expert. Perry Pump, MD 14x6, Solarfilm, Pro Line. Webra .91, Master Climb drive, Kolbo 16x13. 28 MODEL BUILDER Gunter Hoppe, Germany, holds for Matt. Zlin Jeff Tracy, Australia, own CAP 20 L, Quadra, Phil Kraft, Marty Barry holds. Super Fli, Z 50-L, Webra .91, Perry Pump, Webra 14x6. Zinger 18x8, K8iB, acrylic, Kraft Signature. Webra .91, Perry pump, TopFlite 14x6/5. I

Giichi Naruke, Japan, own Chipmunk, YS 1.2, Mark Radcliff, George Radcliff's Super Fli, Rich Brand, Rhodesia,own Zlin Z-526, Webra MS 14x6-112, dope finish, Futaba FP-8-TN. Webra .91, Top Flite 14x6, K8

Ron Chidgey, Ed Keck Spinks Akro, Webra Fred Kugel, Ed Keck Spinks Akro, Webra .91, Denny Donohue, own Stephens Aero, Webra .91, Perry pump, MD 14x6, Futaba/ProLine. Top Flite 14x6, Futaba/ProLine Tx. .91, Top Flite 14x6, Best in Scale, Kraft.

Don Weitz, Keck Spinks Akro, Webra .91, Isao Matsui, Japan, Leo O'Reilly, Australia Bruno Giezendanner, Switzerland, Zlin-50-L, Perry Pump, Top Flite 12x8, Super Poxy, helping. Zlin 50-L, O.S. .90, MS 15-1/2x5-1/2. Webra .91, Top Flite 14x6, Monokote, Pro Line.

FEBRUARY 1979 29 Benito Bertolani, Italy, own Zlín 526-AFS, Harald Neckar.own Zlin 50-L, Webra .91, Top John Lockwood, own Sportmaster 150, Webra OPS .90, Mantua 13-1/2x6, Mantua retracts. Flite 14x6, Graupner Vari Prop. .91. Top Flite 14x6, Futaba Competition.

Norm Cassella fires up Webra .91 with O.S. .61 carb in his own kit Not the best angle on a Hiperbipe! Ralph Brooke's, with Quadra, Steen Skybolt. 15x5 prop, Kraft radio. Donohue holds. Zinger 18x8, Monokote, Kraft. Ralph's design, 17 pounds. year’s contest pretty well sums up the every Las Vegas Tournament of needed for years. For too many years results of the efforts to initiate the new Champions. now, pattern competition has suffered concept. It was written by Bob Upton, "This year's tournament was success­ from lack of interest to all but those our successor as president of the United ful beyond words. The introduction of competitors in the event. Even those States Pattern Judges Association, a the Count Aresti system to model R/C competing showed little interest in the long-time pattern judge at the Nats and aerobatic competition, in my opinion, flying up to the round that separated the Masters Tournaments, and judge at was the 'shot in the arm' pattern has top few places in the contest.

Two photos of Hanno Prettner's power system. Geared prop (2 to 1) driven counterclockwise by two clockwise-running Webra 61 's. Worked faultlessly for all practice and official flights. Further description in text. Interesting arrangement!

Sneaky stall strip blended into tip leading edge of CAP 20 L by Jeff Hanno’s only mechanical failure! Nut holding hatch hold-down bolt Tracy, Australia. Maintained scale outline of aircraft, and legal. came loose. Re-epoxied after one flight with rubber band hood strap!

30 MODEL BUILDER Impressive P-51 with belt-reduction driven 4-blade prop, .61 power. Is that "Walt Schroder" in the cockpit of Denny Donohue's Best in A prototype for Byron Originals kit. Smooth flier. Scale Stephens Akro entry?

"Where the h . . . did it go?" T V cameraperson Aero modeller/R.C.M.&E's busy reporter, Ron Dean Copeland taxis Byron Originals kit Pitts discovers advantage of shooting from shoulder. Moulton, wasn't seated very often. after crowd-pleasing demonstration flight. “ Flying a model in an imaginary ‘box' longer has the time to look down from decide a contest. A half-point system and scoring each and every maneuver, the sky to record a number on a sheet of would have been welcomed. including the turn arounds, proved to paper. A recorder is necessary to record “ I mentioned Art Scholl, who was one be a challenge to both the competitors scores since an almost instantaneous of five aerobatic pilots invited to judge and the judge. If a pilot ‘blew’ a maneu­ decision from the judge is a must. We the Tournament of Champions. Art ver, he was very likely to blow the next could not use flash card holders this year needs no further introduction. Jerry couple of maneuvers due to fact that because of the fast pace of the event. As Zimmerman. United Airlines captian one maneuver flows into the next. far as the decision-making process is and International FAI Aerobatic judge: Consequently, the Aresti type of pattern concerned, it was made easier by going LaMar Steen, pilot and designer of the requires a lot of practice. There is no to half-points system, thanks to Art Steen Skybolt; Gordon Price, Canadian time to ‘fall back and regroup’ between Scholl. As an example, last year’s finals of aerobatic champion and airline pilot for maneuvers. The pilot no longer has the the Tournament of Champions was Air Canada; and Jim Roberts, American luxury of horizon-to-horizon turn extremely difficult to judge. In fact, it Airlines pilot, aerobatic pilot and arounds before the next maneuver, as is was the most difficult contest I've ever builder of the 'Laser’ (an identical afforded by the present AMA and FAI had to judge because of the superb aircraft to Leo Loudenslager’s ‘Laser’) pattern. flying of the top five finalists. We were made up the full size component of “ Judging of the Aresti pattern is using a system that ranged from 7 to 10, judges. Bill Johnson, Downers Grove, different to say the least. The judge no and this is not enough of a spread to lllinios; Masahiro Kato. Japan; Dennis

Bill Bennett and Eddie Morgan take in some between-round demon- Behind every hot shot pilot there's a coolie . . . wiping, wiping, stration flying. Dig those crazy slacks! wiping. NSRCA's Sally Brown look’s after Dave's Zlin.

FEBRUARY 1979 31 Phil Kraft receives AMA Hall of Fame award Leon Shulman receives AMA Hall of Fame Ed Packard, "Mr. Cleveland Models" receives from Walt Schroder. award from now president Earl Witt. AMA Hall of Fame award from John Worth.

Johnny receives AMA Meritorious Service A- ward for 8-year pesidency, from John Worth. Denny Donohue received George Johnson Memorial Award for best scale entry from Louis DeFrancesco. Hunt, South Africa; Geoff Franklin, England; Warren Hitchcox, Canada; Dave Lane. Hawihorne, California; and Bill Bennett passes on famed Walt Billett I, were the modeller type judges. As trophy to Phil Kraft. It will now be retired. previously mentioned, during the next consecutive maneuver when it judge’s practice round prior to the start really only deserved a 7 or a 7-1/2. of the qualifying rounds, it was sug­ “ The Aresti pattern resulted in gen­ gested by Art Scholl that we use half­ erally lower overall scores for the com­ points. It didn't take Doc Edwards, chief petitors due to the difficulty of some of judge, long to get an affirmative deci­ the maneuvers. To my mind, this is good, sion from Jerry Nelson, Contest Direc­ because the challenge is there for pilot tor, to go to the half-point system. This improvemeni. The fliers have something made it easier, believe it or not. for the to shoot for. Theelimination of the take­ judges to score each maneuver because off and landing maneuvers is a decided you could say to yourself .. . ‘it’s not inprovement since it tremendously quite an 8 . . . 7-1/2 is the score.. . ’ and speeds up the pace of the contest. so on. With the old scoring system, the “ As far as judging is concerned be­ flyer probably would have received a 7, tween the full size pilots and the model­ Twin tuned pipes in bottom of Prettner's for the same maneuver; consequently, lers, each set of judges learned from the Dalotel DM-165. Tubes lead to prop bearings. the judge would lean toward an 8 for the other. The full size pilots were very

The carpeted (!) pit area was a tremendous help in keeping the planes Wrong way, dummy! Rich Brand holds while Tony Bonetti demon­ and engines free from dirt. A real luxury! strates how not to flip 24x8 Zinger prop on Phil Kraft’s Super Fli. 32 MODEL BUILDER Judges and officials (I to r standing): Walt Schroder, Jim Roberts, Geoff Franklin, Dennis Hunt, Bill Johnson, Bob Upton, LaMar Steen, Jim Edwards, Art Scholl, Bill Bennett. (L to r kneeling): Warren Hitchcox. Dave Lane, M. Kato, Gordon Price, Gerry Zimmerman, Jerry Nelson.

"Stay close, don't go aw ay!" Art Scholl gets flying lesson from Dave Jerry Puleo prepares his Quadra powered Waco for a demonstration Brown, as LaMar Steen (left) and Doc Edwards watch. flight. Permagloss Coverite in cream with red trim. critical of heading changes while the this who were witness to the Vegas meet. "As a judge, it was challenging and fun modellers were generally more critical I heard not one negative comment by to participate, and I only wish that all of of positioning. The scoring, however, either spectators or modellers relative to you could have an opportunity to judge was remarkedly consistent. I think Doc the pattern flown. Phil Kraft was actually this type of meet. Hopefully, a prece­ Edwards will confirm this. Incidentally, enthused about the Aresti system and dent has been set this year in Las Vegas we agreed on zeros and we modeller for the first time in years, he enjoyed that will be followed in short order. I types learned that they do the same practicing for a contest. Continued on page 118 thing in full size aerobatic contests. It was gratifying to learn from the full size pilots that the judging at the Tourna­ ment of Champions was better and more consistent than the judging at the past Aerobatic Nationals held near Sherman, Texas, where Leo Louden- slager earned his fourth national aero­ batic championship. Jim Roberts and Gordon Price indicated to me that the judging is exactly the same for full size aircraft as it is for models. "In my 14 or so years of judging pattern. I have never had more fun nor been more chalfenged than I have while judging the Aresti system. I strongly urge NSRCA to encourage and promote the Aresti-continuous pattern type of com­ petition. I feel that if pattern flying remains in the same rut it’s been in for the past several years, it will lose support from all but a few pattern diehards. The Aresti system, where semi-scale aircraft are used is very interesting to watch. Another look a* the winner (I to r): Bill Bennett, Hans and Hanno Prettner, Sue Kepler, Walt Several thousand spectators can attest to Schroder, and Al Unser. The finish of a superbly managed show!

FEBRUARY 1979 33 What not to build for 1/4-scale. This 1 2 Ί0 " , 55-lb. F-82 Twin Mustang, being built by John Simone and Frank Johnson, is a good example of what the 1/4-scale movement could lead to unless some upper limits are placed on engine size, wing loading, and total weight.

• This month's article was intended to ment they intended for us, it was that the takes to do it yourself. In other words, be written on the site of what was, in hosts weren't able to join us as fully as don’t be frightened to holler “ help". many peoples' minds, the Mecca for they should have in the activities. Some Look at it this way . . . for every helper Mammoth Scale, Quarter Scale, etc., were not even able to make a single you recruit, you’ll usually have one less namely the 2nd Annual Las Vegas Fun flight because their aircraft lay uncom­ person criticizing the area that person Fly. However, it’s being done at home pleted in order that they could dedicate works in. afterwards because there was just too more time to the meet. I strongly feel At one point in time, there were much to do and see and many people to that in any fun fly, everyone should be apparently 115 pre-registrations with meet who had previously been only a able'to participate, and that in the indications of many more to come, a voice on the other end of the line or future, host areas should only be re­ registration supposedly indicating an some wiggles or series of characters on sponsible for providing the site and aircraft. After the event, I received modern version birch bark. facilities that can’t easily be brought in. copies of the actual registration forms, Our hosts, the R/C Quarter Scale Events, entertainment, frequency con­ numbered 1 to 72, but 9 were missing. I Association of America, knocked them­ trol, and the other thousands of little know EWH’s 3 aircraft were there, but selves out to make the event really items (little until you forget them) could they didn’t appear on the sheets. There something. I’m sure that if they had be shared by the incoming groups, were a lot of cancellations, and I’m sure applied equal effort to the daily choreof provided there is enough back-up to it was mainly because of transportation. making a living, they would either all be take care of any no-shows. Many people intended to fly to Las millionaires or dead from exhaustion. Barb and I arrived early and were most Vegas and may have completed their Larry Vance told me as he was leaving pleased to be able to help in a small way. aircraft in time, but didn't allow enough the site late on Saturday evening that the I learned long ago that people are more time to build a suitable box to get the only thing that had gone according to often disappointed in not being offered aircraft there in one piece. It's one thing plan was the garbage collection detail, a job, and the trick is in utilizing the to get a big model to the flying field up and from the job that crew did, the plan manpower . . . whoops, personpower to 50 miles away, but entirely another to must have been beautiful. . . . without spending more time ex­ get one 3 and 4,000 miles distant. Many If anything took away from the enjoy­ plaining how to do it than the time it people drove, and spent more time on the road than they spent at the meet (we were away for 12 days). When you consider the effort involved to get to the meet, it’s downright fantastic that so many aircraft and fliers did make it. I spoke of the work done by the Vegas people, but without the modelers who came from far and wide with their aircraft, it would have been a wasted effort. One of the best parts of the meet was the display held at the Stardust Conven­ tion Center (to whom we owe a great vote of appreciation for their donation of this valuable facility). It enabled those present to look over someone else's Stinson Voyager by Chris Evans, of Loomis, Ca., was flown at Las Vegas 1 /4-scale Fun Fly. solution to a problem or challenge. Built from Sid Morgan plans, 9' span, 20 lbs.. Quadra engine. Low stall speed with flaps down. When you looked over this huge ex­ 34 MODEL BUILDER panse of floor area filled with while clolh-covered banquel lables, each adorned with a beautiful aircraft, it had to be one of the biggest feasts for the eyes of any modeler anywhere. Those who exhibited their models seldom stuck by it. but were off looking at and enjoying someone else's workmanship, unless they were brought back to their own model by someone wanting more information or a demonstration of his solution to a problem. I’m sure this display was a great lift to all who worked hard to make it a success, organizer and modeler alike. In a recent publication, someone stated that rather than form their own organization, the QSAA should put their shoulder to the wheel and help the AMA. for example. Heavens, I've been modeling for nearly 40 years in more Dick Wetzel's Krier Kraft, built from MB plans (No. 10771, S8.50) but using a fiberglass fuse­ than one country and I recognized so lage. Model has over 25 hrs. flying time on various engines, didn’t say what he's using now. many people at [hat meet who have had landing path, coming in dead-stick, or and at fairly high altitudes, which cer­ their shoulder to the wheel for so long any situation just outside the pilot’s that their shoulders have taken on a tainly affects the performance of engines present flight vision envelope as well as and airframes alike, and then going permanent set! When one has his keeping the pilot from flying over shoulder to the wheel, it’s often difficult through all the registration forms for people, the pit area, or into obstacles, weights and power plants, etc.. I’ve to become the wheel itself or have etc., which is very easy to do if you're come up with some useful information attention directed on anything else. flying on a strange field. It works well, for us rule-of-thumb engineers. One is Perhaps it’s time to realize that not all especially if the experienced flier uses a that if you want to be assured of crisp modelers are serious contest competi­ learning buddy and the learning flier tors. There are those who prefer instead aerobatic performance, strive for 10 to provide their own challenges within uses an experienced one. The side pounds (or less) per properly applied benefit is usually a faster, less painful hp; i.e. 20 pounds with a Quadra. If you their ability. Large models have pro­ learning process for the beginner and a vided this broad challenge. I hope ii go higher than that, the aircraft design, “ practice” judge for the expert who is never gets mastered to the point where trim, and piloting ability will have to interested in improving his flying and it becomes just another commercial make up the difference. In aircraft that can ill afford a mid-air. etc. are not intended to be pattern per­ enterprise. There were also criticisms overheard, The heaviest plane at the meet formers, but are capable of mild aero­ weighed 45 pounds. It was James E. batics, use a 15 pound per hp limit. At 20 and we can all learn from these. It should Cline's Robin with McCullough engine, have been entirely a big airplane show, pounds per hp, you’re going to run into scratch built, 12-foot wingspan, photo problems getting reliable takeoffs, as most people did not come there to be aircraft. The heaviest aircraft that flew entertained but to learn from others' although once in the air it’s going to realistic aerobatics was Jim Folline’s experience which was so freely offered. depend largely on the aircraft and the PT-19 at 31-3/4 pounds. Quadra pow­ (There were no competition secrets pilot. There are exceptions, such as the ered, 9-feet wingspan, winner of the here.) Anything which robbed them of Taylor-flown PT-19 previously men­ military category and flown so well by tioned, and wing loading certainly has a this opportunity, especially those who Lee Taylor. could spend only a few hours there, Continued on page 103 detracted from the theme of the meet. Having watched this armada of aircraft Much effort went into obtaining those perform in well over 100° temperatures See sketches next page. ------► beautiful perpetual trophies and also into making the shipping crates, but they are going to create a lot of work perpetually. The QSAA recruited a lot of members on a non-competition plat­ form. and it's too bad they couldn't keep it that way. A lot of members were unaware of any trophy presentation prior to the meet, and next year it won’t be the same. The tropies are there, they’re beautiful, and people will try to win them. The theme for the QSAA shouldn’t have been "Big is Beautiful” but ” Keep it Simple". Here are some statistics of the meet. There were 282 official flights during scheduled times, 2 crashes, and 1 mid­ air. Qne of the crashes was a twin ” legal'' pattern ship on exhibition. The mid-air was a takeoff/landing situation which clearly indicates again that frequency control isn’t the only requirement. Takeoff/landing and circuit direction should also be indicated, even in no­ wind conditions. This was soon rectified and also a buddy system put into opera­ tion, where a buddy would warn his flier Closeup of the nose on Bradford Allen's 1 /3-scale Aeroňca C-3 Master reveals a two-cylinder that another model was in the air, on a Ouadra! Not really, the one on the model's right is a dummy. Sure looks real, though! FEBRUARY 1979 35 ROTATIONAL FORCE i FIG. 1

1) Main gear too far back. 2) Nose down attitude causes wing to provide negative lift, adding weight aerodynamically. 3) Thrust line pulls model down, adding further artificial or THRUST dynamic weight to gear, directly proportional to drag on wheels due VECTOR to runway condition, tires, wheel bearings, etc. Rotational effort of elevators causes tremendous aerodynamic drag.

* ROTATIONAL PIVOT POINT

FIG. 2

HIGH ANGLE OF ATTACK PROVIDES THRUST ANGLE & UP ELEVATOR & LIFT BUT HIGH DRAG 4 TAILWHEEL DRAG TENDS TO FORCE HIGH DRAG DUE TO HIGH ROLLING WHEELS DOWN RESISTANCE OF A SMALL TAILWHEEL POOR BEARING "CLUTTERER" STEERING MECHANISM

FIG. 3 ROTATIONAL PIVOT 1) Too small or large flotation. Too small: will not come up on step, excessive spray. Too large: unnecessary surface drag. 2) Step too far back. Digs in on rotation, pivots at different points. 3) Negative angle of attack of wings when float is at best planing angle. 4 | Step behing CG and C L position, tends to make front of floats dig in. Additional power only makes things worse. 5) Excess elevator required to force rotation. If liftoff is achieved and up elevator is held after floats leave water, aircraft will pitch up abruptly as float drag is suddenly removed. Aircraft is almost cer­ tain to stall. 6) Floats not parallel with each other, with the aircraft, or at the ♦ same angle of attack. Float alignment is as important as wing PIVOT POINT FOR FLOATS alignment. 7) Misaligned water rudders. 8) Float attachment hardware and struts in high speed wash area. FIG. 4a I 4 % FIG. 4c

FIG. 4b *

Worn wheel bearings or bent axles cause main wheels to toe out when moving, aircraft will dart in either direction as soon as nose wheel lifts off. Solution: bend gear around nose wheel so that center of wheel drag is in line with nose gear strut. Adjust toe-in so that when wheels are gently forced outward, Make sure aircraft tracks and rolls straight, wheels are straight or only slightly toed in. not only in 3-point position but in tail up or Excessive toe-in causes drag as well. nose up position as well. Runs straight, but oh the drag!

36 MODEL BUILDER Kit contents. Foam building jig on the right is very helpful for main- Bill Brazzle is very happy with his Klampon Kai. Compare the modi- taining alignment of the hull during construction. fied cowling with boat at the bottom of p. 39. 1970’s, when Charlie was attempting to develop a boat to take to a big race in PRODUCTS IN USE Hawaii. At that time, the only outboard PHOTOS BY AUTHOR available was the Fuji 15. What the Fuji 15 made up for in appearance, it more than gave away in performance. A hot per­ MIDWEST PRODUCTS' KLAMPON KAI, by JERRY DUNLAP former it wasn’t. After that Hawaiian contest, the Klampon Kai design was • A relatively new manufacturer on the about the Klampon Kai? Well, let’s take sorta put on a back burner, since little (if model boating scene is Midwest Prod­ it from the beginning, since I had a small anything) was cooking in the way of ucts Co., 400 South Indiana St., Hobart, part in dealing with this model as a plans model outboard racing. However, the Indiana 46342. Although a new arrival in article. introduction of the K&B .21 Outboard a model boating, Midwest has been The Klampon Kai is an outboard couple of years back really started things around the R/C airplane scene for many tunnel design developed by the gentle­ cooking again, and Charlie was one of years. One of the first R/C planes I ever man who used to own Marine Special­ the first model boaters to get his hands saw fly was a Midwest Tri-Squire, and ties, prior to turning that business on the new offering from the folks at Midwest continues to offer a wide venture over to K&B Manufacturing. Downey. Charlie tried the K&B Out­ variety of model airplanes for R/C flying Yes, it was none other than good ol' board on his original tunnel and im­ enthusiasts. But we’ve digressed. We’re Charlie Pottol who drew the lines for the mediately found that this boat was much supposed to be telling you about the Klampon Kai. Actually, the version that too small and narrow to handle a real Midwest Klampon Kai Outboard Tunnel, is featured as Midwest’s kit is something racing-type model outboard. Charlie and not about its line of fine model like number 4 or 5 in a progression of redesigned a tunnel during the summer aircraft. So, what’s there to tell you tunnel boats that date back to the early of 1976 in order to have something ready

The framework on the foam building jig. Map tacks work welt in Clamps are used to hold the sponson sides to the basic framework, holding the framework to the jig. still on the foam jig.

Masking tape, pins, and clamps (what, no staples?) hold the sponson View showing the modifications the author made to the top of the bottoms in place. boat to change the looks of the cowling. FEBRUARY 1979 37 Front view of the deck, showing the cockpit and radio compartment. Closeup of the stern, showing the changes made in the transom area.

Tape and clamps hold the decking in place until the glue dries. All kinds of clamps being used to hold the cockpit cowling in posi­ tion. Remember, this is not the stock cowling. for the First Annual Golden Gate Out­ later that Charlie and the folks at Mid­ didn’t like the cowling design when I board Regatta, hosted by the San Fran­ west got together and came out with a wrote the construction article for RC5, cisco Model Yacht Club in early Novem­ kit version of the Klampon Kai. and the same cowl is employed on the ber of that year. It is at this point that Since I am also a designer of model kit. The Klampon Kai cowling design is your au thor sorta slides into the Klampon tunnel outboards and have my own not scale appearing. It’s functional, it Kai picture. Charlie and his wife, Pat, design available in fiberglass, reviewing gets the job done, but it doesn’t satisfy who this writer thinks is one of the really other people’s tunnel kits is comparable my needs for a scale-appearing cowl. So neat ladies in model boating, invited me to Henry Ford doing a review in Car & I changed it. to attend the race and spend (he week­ Driver on a Corvette. I will attempt to be Hopefully, our esteemed editor end with them. It was a super weekend. honest in my opinions, even though I will see his way clear to use a bunch of Charlie and I spent most of our time don’t always agree with the way certain the photos of my modifications. I’m not arguing about almost everything, and things were handled in the kit. Since I’ve even going to tell you how to make Pat provided great meals and plenty of already stated there were parts of the kit these modifications. If you’re building a beverages. She mu'1 have been doing I didn’t like, let’s get those out of the way tunnel for the first time, build it the way the right things, because she ended up first. They are strictly personal opinions the plans show. If you've built wood kit placing second on race day. As usual, and definitely not criticisms of the boats before, you can figure out how to Charlie and I didn’t resolve any issues, materials, construction technique, or make the modifications by looking at my but I did agree to write a construction plans and operating instructions. The pictures. Did my modifications improve article on his Klampon Kai. That article only thing that I didn't like about the the boat’s performance? Not one bit. appeared in the February 1977 issue of Klampon Kai is the manner in which the But I didn’t make them in hopes of RC Sportsman. It was just about one year cowling is designed. I mentioned that I improving performance. Did I improve

The modified rear cowling is built over the cockpit sides. Saran Wrap Modified rear cowling after being removed from cockpit. Simple prevents unwanted glue joints. framework is easy, quick to build.

38 MODEL BUILDER Tape holds side piecss in place on rear cowling. Basic hull structure is complete.

Closeup of bow, showing body putty application. Radio, fuel tank, and engine installation in the Klampon Kai that the author built for Bill Brazzle. the appearance of the boat? Obviously, many wood kits, it’s always a good idea trophies since last April. I know he's that's a matter of opinion. I'll let you to familiarize yourself with the direc­ beaten me on a number of occasions. I decide for yourself. I like the way it tions and pieces prior to mixing that know for a fact that his Klampon Kai was looks, and so does Bill Brazzle (he races epoxy. Speaking of the pieces, the the kit that won more events than any the boat). material is top grade throughout. No other commercially available model complaints from me in this area. tunnel. The boat has been a big winner One of the strongest selling points for During the past six months, I have up this way. this kit is the building technique. The In summary, the Midwest Klampon Midwest people came up with a super­ seen at least a half-dozen Klampon Kais built by novice model boaters, and they Kai will prove to be a good design for slick idea when they decided to include both the beginner and more advanced a foam building jig for framing the have all run respectfully. I’ll even go model tunnel racer. Although I chose to Klampon Kai. Without question, the farther than that and say that some of make some cosmetic changes of the most important part of building a tunnel them ran well enough to win quitea few of the races we held for model outboard cowling, I don’t recommend this for a hull is true alignment of the framework. novice builder. In an area that is defi­ The foam building jig helps assure that tunnels up here in the Northwest this past year. We do more organized out­ nitely a “ hot bed” for model outboard the framework aligns properly during tunnel racing, the Klampon Kai has the initial construction phases. I'm not board racing up this way than any other section of the country . .. the world, proven to be one of the top boats going to give you a piece-by-piece available. If you’re considering building account of how to build a Klampon Kai. I even. One of the new members of our local club, John Moss, has used a Klam­ a wooden outboard tunnel, you just found the directions and illustrations might want to latch on to a Klampon.· more than adequate. If you haven’t built pon Kai to bring home a whole batch of

The Midwest Klampon Kai really scoots, as this photo shows. This Photo from Midwest of an unmodified Klampon Kai. Author's boat can be competitive for beginner or expert alike. cowling changes were for looks only, no gain in performance.

FEBRUARY 1979 39 Texaco fliers waiting to get their models weighed, I to r: Jack Albrecht, John Pond, Don Bekins, Al Heilman, and Karl Tulp. Photo taken at the 1978 John Pond Commemorative meet held at San Luis Obispo. One of the best flying sites ever, this meet will again be held here in 1979. type cabin models, restricted to 36-inch wingspan. The latter event, pioneered by the SCAMPS, has proven to be extremely popular. Some of the fun things noted around PmiPARKS the field were Gene Wallock’s Nimbus (a PHOTOS BY AUTHOR ten-foot flying lumberyard) seen landing in the foothills of Taft, followed by a tall By JOHN POND column of black smoke. Bruce opined the smog controls on Gene’s Super • Texaco Double Header! That’s just but this didn’t prevent Cliff Silva from Cyclone needed adjustment. How about about the best way to introduce the winning with his Baby Cyclone-powered that? Ken Sýkora, the peppery writer of column this month, as we are going to Michael Roll Berryloid Winner. Cliff has the SCIF Flight Plug Newsletter, was report on two great contests (unfortu­ been working on the engine for two observed producing kits from full­ nately held on the same day!) that were years and his efforts were rewarded with blown models. However, for the rubber held within a hundred miles of each better than a 14-minute motor run. No event, his Paul Plecan “ Paragon” had the other. problem to make the total time of 27:08 boys talking about building the “ new” In deference to the free flight boys, then! super threat. we will report on the SCIF 12th Annual Bruce Chandler also noted that in Jack Godfrey, who came all the way Texaco meet held on October 15,1978. addition to the Texaco Event, two other from Hamilton. New Zealand, to attend (Columnist’s note: one of the big prob­ events. Old Ruler and Commercial this meet also suffered from the two lems in reporting on free flight is the Rubber, proved to be what the doctor meets being held on the same day. dearth of news.) This meet enjoyed a ordered for rounding out the fun. Fortunately, the week before, he was nice day with very few thermals. Sure cut For those who don’t know what the able to visit the San Francisco Bay area down the chasing to the point where foregoing events are, briefly explained, and meet most of the fellows who were Bruce Chandler (the C.D.) could truly the Old Ruler contest allows original absent. He brought an Air Trails Sportster claim “ expanded R/C coverage” . designs built to conform to the 1940 powered with a Mills 1.3 cu. in. diesel The Texaco event turnout was down NAA rules. The Commercial Rubber and a rubber model called the Airsail due to the R/C boys flying on the coast, event is for rubber-powered R.O.G. “ Ascender” , looking very much like a

Carl Hatrak and his Mickey DeAngelis "Kloud King", at the '67 Karl Tulp has won many a meet with his Lanzo Record Breaker. AMA Nats at Los Alamitos NAS. Photo taken at 1978 West Coast R/C SAM Champs at Fresno.

40 MODEL BUILDER Jim McNeill (left) awards the AMA Outstanding Service Plaque to Rare Australian rubber job, the "Sky Rover Senior", to be restored Bryton Barron, a long-time promoter of model flying. by Max Starich, O .T. columnist for Airborne magazine. Korda Wakefield. He had more darn fun being carried on at the Campus. with his COj-powered Pietenpol Air With the Santa Maria boys (sorry, the Camper that made simply lovely rise- names escape me) running the meet, off-ground (R.O.G.) flights. Now he can you couldn’t complain one bit. There say he flew at Taft! were processors everywhere, ready to Prizes were just great, as they always weigh your model, measure out the are when jack jella (the proprietor of Air required amount of fuel, and of course, Trails, Inc.) donates the trophies. The timers every place. Matter of fact, the trophies were made up of R/C Cola writer was timed so much by Bob Angel, bottles with large ribbons holding large he almost thought he had his own engraved discs. Of course, the winner personal timer! opened the Champagne (in this case. This two-day meet featured all the Cold Duck) and as Bruce Chandler puts limited engine run events on Saturday, it, it was truly another touch of class with with Texaco strictly set aside for Sunday. expanded R/C coverage .. . haw! Best This worked out beautifully, as the part of it all is that the contest made Texaco event turned out to be quite money! demanding on timeand timers. After all, there were 25 entries in this event alone! )OHN POND COMMEMORATIVE The columnist had to smile after the Originally called the john Pond Me­ Pilots’ Meeting when John LeSuer, after morial until someone asked when this carefully spelling out the confines of the columnist died, this meet just keeps get­ landing field (which was huge), promptly ting bigger every year. This year was no missed the field twice himself! Not exception, as competition is getting content with landing on the other side keener every year. Imagine Don Bekins of the barbed wire fence, the next time Jim McNeill and the loot he won at the Jim getting ninth place in Texaco with a 15- he landed on someone’s automobile! Kloth Memorial contest. minute flight! This year, john LeSuer took over the Contest Director duties, as Tom Bristol, the annual alternate, fell off a ladder when painting his home, breaking both a leg and an arm! At the time of the meet, Tom was still confined to a wheel chair. Tough break! Luckily, it was John’s turn to run the annual affair, and he promptly relocated the meet to the Cal Poly Campus farm area. As a word of explanation, John LeSuer has been flying RPV (remotely piloted vehicles) for Professor Nicho- laides, head of the Aeronautical section at Cal Poly, and it was only natural to take advantage of this lovely field. Only one drawback; no beer allowed on the field, as it was a California school area! As the columnist moaned, it surely made for a long day! Full credit should be given to John LeSuer and his wife, Helen, for the tremendous job they did in organizing the meet, arranging for motels, housing, etc., staging the most enjoyable Saturday night dinner with trophy awards and, of course, the entertaining after-dinner speaker, Professor Nicholaides, on his "Flying Mattress" type planes and para­ chutes. together with the RPV progress FEBRUARY 1979 41 Ross Thomas and his wife, Maxine, with Ross' 100" Shereshaw Monty Terrel (left), of Mulgrave, Australia, has flown this Denny- "Eaglet". O.S. .60 4-cycle power. Plans scaled up by Bob Sliff plane for eight years. Didn't get other fellow's name. (see "Hobby Horn" listing in Classifieds). He finally salvaged a third place despite the first two zero flights. As a spectator treat for a change. Bob Boucher of Astro Flight sponsored an electric event ably directed by Bob Sliff, with judges john Pond and Jim Adan >■ (Talk about getting the SAM bigwigs to do your work for you!) Three events were scored as a single contest; precision flight, precision-duration, andstatic display. This most interesting event ended up being won by Bob Sliff, with Don Bekins and Ross Thomas being close second and third places. Those interested can write to Bob Sliff, 8044 Legion Place *6, Midway City, CA 92655 Bob VonKonsky with his 14'8" Boehle "G iant", at the 7 8 Pond Commemorative. The 11-lb. for complete rules and information on mammoth is now powered by an O.S. 4-cycle. That's a one piece wing! how to put on this new fun event. ignition engine you can be competitive! Antique event. Phil also pulled a second Well, we couldn’t go much further in One interesting facet of this meet in Class C. It’s gonna be rough around this column without telling you that turned up in that in order to speed the office for awhile! Lawrence Bekins again beat out Dad flights up, if you had an engine over-run, Probably the most popular win was Don Bekins for first place in Class A/B you were simply credited with a 20- the last-minute flight by Hal Cullen,one Limited Engine Run. As noted more than second flight! Man! That made some of of the perennial also-rans who never once, the younger Bekins is simply the boys (including this columnist) sit up quits trying. Hal hit thedarndest “ boom­ uncanny for his ''feel” of thermals, as he and pay attention! This was made all the er” you would ever want to see after a is yet to touch down in less than five rougher with only three official flights frustrating day for most, who simply minutes. (six attempts with anything over 40 couldn’t develop much lift. After a half In looking over the winners, the new seconds being an official. Try getting hour, Cullen was told to bring the model rule giving ignition motors a 40-second down from an over-run in less than 40 down, as he was the winner and it was engine run, as compared to the glow seconds!). getting time to close the contest. version of 20 seconds, didn’t catch the boys looking, as ignition-powered mod­ The gang at Model Builder had a right As usual, the trophies were awarded els took four of six places, and the to swell up their chests when Phil by the namesake of the contest, John Antique event was dominated by igni­ Bernhardt came in first with his Super Pond. Other big winners were Bob Sliff, tion across the board. No question Cyclone-powered Ehling Contest Win­ Ross Thomas, Karl Tulp, and John about it, when you get a good running ner. Not content with winning the LeSuer. Sweepstakes winner this year

Don Bekins has been doing extremely well in Electric O .T. events Even the CD gets to fly! Mike Poorman flew his Ohlsson ,60-powered with this Cabin Playboy. Astro 10 with belt reduction. Comet Clipper while CD’ing meet in Bowie, Maryland.

42 MODEL BUILDER Santa Anita in 1948, the Hassad engine was unable to hold its own against all the other new racing engines coming on the market. A remarkable similarity to the problems of the Sky Devil arose, as the Bluestreak still did not perform as well as the original Hassad Custom. No ques­ tion about it, that extra finishing touch Ira gave to his reworked engines made a definite difference. Interviewed by Bill Thompson, of San Diego (to whom we are indebted for this information), Hassad stated that the Bluestreak was his last engine. I always felt bad that the engine did not become popular. It just didn’t have what was needed to pull controllinespeed planes. From Donald Saunders, of Addison, Michigan, comes this photo of his reconditioned Super Buccaneer, which he originally built in 1945. Now flying with radio. Until this day. I can’t tell you why. By this time, Ira Hassad finally had was Don Bekins. At the close of the 2000 engines were produced. Surpris­ enough money and equipment to start meet. LeSuer announced that the Fifth ingly, there were a few left to be sold by his own machine shop to specialize in Annual |ohn Pond Commemorative Ted Tyce as late as 1972. By April of 1973, work on full-size hot rods and racers. would again be held at the Cal Poly the firm announced that all parts to This may come as a surprise to many, but Airport on October 13 & 14,1979. Paste make any engines had been sold. Ira had always wanted to work with full- that in your hat! It was no great surprise that the engine sized machines. Actually, working with ENGINE OF THE MONTH turned out to be a good one, inasmuch models had ceased to be fun, and here This month's engine is a follow-on to as it used all internal parts of the Model was the chance to launch a new business the Hassad Sky Devil we wrote up 1500 SD Sky Devil. Specifications, of into the automobile racing business. A several months ago. course, remained the same as the Sky quote from Ira might be in order: "I Actually, the Hassad Bluestreak came Devil, with the exception of the exhaust don’t know if I was getting tired of about when the Engineering Develop- and bypass ports being rotated 90 models, or the others were getting meni Co. (EDCO) got into financial degrees. better.” trouble and had to declare bankruptcy. Although the new engine promptly To this day, Ira and his wife run a large Among the main creditors were the Tyce won the championship stunt event at machine shop in El Cajon (a town east of Brothers of Chula Vista (a town south of San Diego). The business is known as San Diego), known as the International Lomar Machine Works (Lomar from his Tool Company (Aircraft Engineering wife’s name. Lois Marie). As noted by Bill Service), who found themselves the Thompson. Ira said the secret of his owners of a large supply of Sky Devil success was ‘‘Dare to be different” . parts. 30 YEARS AGO. I WAS. . . In an attempt to salvage some of their The columnist is delighted to receive a investment, the company hired Ira letter from Dick lohnson of Dallas, Hassad to come up with an engine that Texas, as forwarded by Bill Hannan. Dick would use the parts on hand. Race cars goes on to say: had run their course and it now being “ Your photo of the Scientific Mercury 1947. there was a tremendous demand and story in the March/April issue of for a large, hot controlline and free flight Model Builder really cause the memory aircraft motor. muscles to twitch. Going back to the late thirties and early forties is a real long By early 1948. Hassad had come up trip. with a new design. To show his versatil­ "At the ripe old age of 14. already a ity, he made up the dies for the per­ stick-and-tissue veteran of three or four manent mold castings. This included years, I dreamed over the GHQ ads and crankcase, cover, and extension. The watched the "big boys" fly gas models. rest of the motor was made up from the Edco parts. A slight difference in ma­ An older friend, Andy Campbell, of chining for the pistons and heads was Oklahoma City, had a big red Scientific Mercury. It had. of all things, a Bunch evolved to allow for a left-hand exhaust. Ohlsson .60-powered Rambler by Bob Bissett, As far as can be verified, about 1500 to flown at Bowie, Maryland contest. Continued on page 120

Ed Rangus tunes the Forster .29 in his Ranger for an official in Look at all the stuff hung on the nose of an otherwise nicely stream· Class B Pylon at the '78 SAM Champs. lined Shereshaw "Polly". Danny Sheelds built it.

FEBRUARY 1979 43 OLD TIM ER Model of the Month Designed by: Harry Edsall Drawn by: Al Patterson Text by: Phil Bernhardt How many pushers, single or twin, have you seen at the last few Old Timer rubber contests you’ve been to? I thought so. Except for pusher-only events, such as the one recently held by the SCAMPS (see the Dec. 78 “ Plug Sparks” column), these types of models are rarely flown in competition. The general feeling seems to be that pushers just can’t hack it when pitted against the tractor type ships. Which is just so much foof.as faras I'm concerned. My first O.T. rubber ship, built about 10 years ago, was a twin pusher from plans published in some obscure 1929 model airplane book. It was the type of model that would bring tears to the eyes of any hard-core O.T. purist . . . non-free-wheeling props, single-surface wing, bamboo ribs and wing tips, and exposed motors. The thing flew exceptionally well, and had I been able to keep one long enough, I probably would have done well in competition. But the models (I built a total of five) had a habit of flying away; at least three are lying in the badlands of Taft, slowly bio-degrading into nothing. Single pushers are excellent per­ formers also. The one we are presenting this month was designed by Harry Edsall, of Springfield. Ohio, and was published in the August 1933 issue of Universal Continued on page 114

These are the same photos that appeared in the original 1932 article in M.A.N. 44 FULL SIZE PLANS AVAILABLE - SEE PAGE 128 MODEL BUILDER Simple electric glider winch available from Don Daly, of Denver, Colorado. Price of $135 includes everything but the 12-volt battery and cables. See text for more info on this and three other currently available winches. You can order this winch reel sep­ arately for $30. It’s made of heat-treated aluminum. The side plates and spacer hub are machined for trueness in as­ R/c SOARING sembly and operation. The reel is light and thus reduces "flywheel” overspin. by Dr. LA R R Y FOGEL PHOTOS BY AUTHOR It’s machined to fit a 5/8-inch diameter shaft starter motor. A turn-around is also • There's no doubt that a strong arm is foot switch, all for $135 plus the shipping available separately for $25. It includes a the cheapest way to launch a sailplane. charges. This price does not include the base, line tracking guides, and a two- But from the altitude that method battery and cables. Don assures me that way swivel unit. I’ve seen this winch in provides, it takes a lot of skill and luck to this winch will easily tow heavy models operation. It’s a dependable asset. find a thermal. I’m glad there are other “ out of sight.” He'd be pleased to Hi-Flight Model Products (43225 ways to launch off flat land. There's hand provide you with such a winch if you W hittier Avenue, Hemet, CA 92343) tow, hi-start, use of an R/C tow plane, send him a $50 deposit, the balance offers the Hi-Flight 12 winch (for $179) and of course, the powered winch . . . being paid C.O.D. which is powered by a conventional now standard for contestsand when you Bill Amour (20326 Madison Street, automotive battery (not included in the really want to "get it up there” . Let me Torrance, CA 90503) offers an electric purchase price). This winch is unique in call your attention to four winches winch which operates on either 6 or 12 the fact that a single foot control allows currently on the market. volts. The 6-volt operation is for small the flier to choose slow, medium, or First, there’s the electric winch offered sailplanes, while 12 volts provides the high winch speed. The speed may be by Don Daly (3035 West 63rd Ave.. added "get up and go” required for the varied continuously during the launch Denver, CO 80221). This winch is 18 by 12 big birds. A 12-volt starter motor is as dictated by the size of the sailplane by 9 inches, with a carrying handle buili mounted on an aluminum welded and and the prevailing wind conditions. You into the design. It weighs 24 pounds anodized base. Bill provides all required want to use low speed for line ten­ without the line and battery required to battery cables, a reel, push-button run­ sioning and launching light aircraft complete this launching system. Don down switch, on-off switch, the foot under windy conditions. Medium speed recommends the use of a standard 12- pedal for actuating the unit, and a turn­ is appropriate for standard class sail­ volt battery to drive the starter motor, around, all for $185 F.O.B. Torrance, CA planes in dead air or unlimited ships which turns an aluminum drum. He also (excluding the battery and nylon launch under breezy conditions. The high provides a turn-around (an aluminum line). He offers a similar winch, but speed launch will take care of the pulley on ball bearings), and an electric restricted to 6-volt operation, for $169. heaviest unlimited class sailplanes with

Another simple electric winch, the Hi-FHght 12, from Hi-Flight Model Products, Hemet, Calif­ Hi-Flight's Bill Mueller is testing a line retrieval ornia. Ultra-simple foot switch allows slow, medium, or fast winch speed. Comes in kit form, too. system for the Hi-Flight winch. FEBRUARY 1979 45 Sturdy, well-built electric winch by Bill Amour, of Torrance, California, w ill operate on either 6 John Lupperger's original design "Ridge Runt" or 12 volts. Cost is $185, excluding the battery and nylon towline. was inspired by the "Beaver", a Pilot kit. ease. An isolation switch is provided to eliminate high speed take-up if the pilot desires this safety feature. Bill Mueller designed this winch to relieve the pilot of pulsing (with the attendant uneven­ ness in the launch). The foot pedal uses open contacts .. . surely reliable be­ cause of the simplicity. I’ve used this winch, and it worked well for me. Hi-Flight also offers this winch in kit form including everything needed, with the exception of the motor and winch drum ($98). Machined and welded aluminum alloy winch drums are available in two sizes: two-inch core for 12-volt operation, or four-inch core for 6-volt operation, at $29.95 each. Winch motors and flight line (120 pound test) are also available from Hi-Flight. By the way, Bill is now experimenting with a line retrieval system . . . one that will not increase the weight of the launch line towing the plane to altitude. I look forward to seeing this in operation. Beautifully-made gasoline-powered winch by Ralph Learmont, of Melbourne, Australia. Uses a You may remember Ralph Learmont Br,99s & Stratton engine, not included. No word on price, but you can bet it won't be cheap!

Setting the line tension. The pull can be adjusted for anything be- Ralph Learmont and his Launch Master winch. Also included is a tween 0 and 20 pounds. Line tension remains constant. line retrieval system that brings the towhook back to the winch.

46 MODEL BUILDER

_ Sequence of photos of John Lupperger's Ridge Runt making a close pass at Torrey Pines. Model has a 49-inch wing with a 10% flat bottom airfoil. Really moves out at 9 oz./sq. ft. (31 Queens Parade, Burwood 3125, throw does. It’s really extremely safe.” second person is needed.” This beautiful Melbourne, Australia), designer of the This Launch Master winch is produced design is more costly than conventional quarter-scale Kestrel 17. Ralph now by Ralph Learmont’scompany,Southern winches, and there’s the sound of the offers another example of his ingenuity Sailplanes. It weighs 37 pounds, “ which engine to deal with. Ralph guarantees . . . the Launch Master fully automatic alone is lighter than a car battery.” He the winch for six months and claims that self-regulating winch. Here you can also provides a retrieve unit (which "this system should more than pay for adjust the winch to pull with the desired weighs an additional four pounds). This itself very quickly by charging, say, 10

Closeup of the radio installation in John's 747. Ailerons are driven by John's 747 gets a launch. Model looks quite realistic in the air, causes torque rods set into the top surface of the wing. hang glider pilots at Torrey Pines to do a double take. FEBRUARY 1979 47 Herb Semmelmeyer's beautiful "Elliptical" multi-task FA I design, featured as a 3-view on page 50. The model shown here was built by Harry Menke, of Santa Rosa, and was flown in the 1976 LSF Tournament held there. Model has a 117-inch span, 1046 sq. in. area. DESIGNING ^ SAILPLANE By DAVE THORNBURG . . . Part Two of a series, Dave discusses the pros and cons of "penetrators" and "floaters", and sets down some design parameters for a hypothetical minimum-sink sailplane.

Lasl month, amid a flurry of name- Soarer. After all, we’re here to design a So which will it be, minimum sink or dropping and plugs for just about every­ new sailplane, not merely to draw one. maximum go? body’s book but my own (it hasn't found You design for performance, you draw a publisher yet), we discussed airfoils for looks. Right? (Let’s hear a little more Minimum sink means the ability to and made a few infuriating generaliza­ enthusiasm out there. And turn down ride very light lift, to stay aloft a little longer in poor conditions, to make a tions, to wit: that TV, will you?) slow and gentle landing after a slow and 1) Fatter airfoils (10-12% and up) are So ask yourself this, for starters: do gentle flight. Minimum sink designs are easier to build and easier to fly than you want to design a floater or a pene- relaxing and forgiving to fly, and as a skinny (9% and under) airfoils. trator? Do you like the slow, gentle, consequence they’re very popular with 2) Skinny airfoils are generally faster forgiving performance of the beginners and “ Sunday fliers’.’ and and more efficient than fat ones. Olympic II, or do you prefer the fast, (surprise!) contest winners as well. (An 3) Airfoil IS design. The shape of the smooth, powerful feel of the Astro Flight airplane that’s slow and easy to land is a airfoil (in conjunction with the wing ASW-17? This is the basic choice you jave natural for spot-landing accuracy, and loading) determines the performance to make, the choice between minimum since 90% of all American contests are range of the sailplane. Everything else is sink and maximum go. You can’t opti­ won or lost on the ground. . .) It's largely cosmetics. mize both in a single airplane, because probably safe to say that “ minimum Before we start our actual doodling on they’re at opposite ends of a broad sink’’ designs represent 70-80% of all kit paper, let’s look at some of the implica­ performance spectrum. Only my hero sales in the U.S. at the present. . . take a tions of these three points. They can Muhammed Ali can float like a butterfly poll of at least three flying sites before help us make some basic decisions AND sting like a bee . . . a sailplane has you disagree ... so if you opt for about what we want from our Dream got to settle for doing one or the other. minimum sink, you certainly won’t be

Simple, functional tail feathers on the Elliptical belie its carefully The 18-inch elliptical dihedral wing tips were built on a special jig. thought-out design, balanced proportions. Herb soaks the balsa with ammonia to mold it.

48 MODEL BUILDER alone. But “ maximum go” sailplanes have an appeal all their own. Just ten years ago this winter I got hold of my first one, a Fliteglas Phoebus, and it taught me more about soaring in six months than my four previous years of flying minimum-sink ships had done. Since then, I’ve owned three Hobie (now Midwest) Hawks, one overweight (34 oz.) Windfree, and two Graupner Cumuluses (Cumuli? Cu- mulese? Cumulae? Oh. hell . . I owned a Graupner Cumulus, and then another one just like it!). Also a Soarcraft Libelle. All these ships had one thing in com­ mon: the liked to move around the sky pretty quickly. Put the nose down and they were gone, no questions asked. Dave Thornburg launching the Schweizer 1 -29 mentioned in the article, out on the New Mexico Slow them up too much in a tight flatlands, about 1970. No need for frequency flags when you fly alone! thermal, close to the ground, and you inches, 120 inches, and other sizes that miss this phenomenon as "scale effect" were through flying for the day. are dictated either by rules or by rulers. or "Reynolds number effect” , but what They were like rack-and-pinion racing Ninety inches is a nice number. Besides, it is, basically, is magic. Big airplanes cars, after years of driving sluggish family I had a lovely little Schweizer 1-29 with a simply fly better than small ones. It sedans. They gave me a sense of power, 90-inch span, once. Flew great until I doesn't please me to admit this, because precision, command, with a little shot of wore out the wing, and replaced it with I prefer smaller airplanes. But it’s true. danger thrown in. These ships weren’t at one that had a laminar-flow airfoil, like So what kind of wing loading should the mercy of every gust and bubble . . . the full-scale 1-29 has. What a bag of our 90-inch floater have? Let’s take a they didn’t hop and bounce all over the worms! Had to double the wing loading quick look at the wing loading chart for sky like windblown Kleenex, registering to get a decent glide, and then it flew some of the popular kits on the market every nuance of turbulence, every roll fine again . . . at about 30 mph! (That’s a today. The Oly II comes in at 5.9 ounces a and toss of the restless air. Instead, they scale speed of almost 200 mph!) foot, the Windrifter at 6.8 . . . and that went planing about in smooth and Standard class floaters usually run about brackets it. A figure of six to six- graceful arcs, riding invisible rails. They about 4 or 5 ounces per linear foot of and-a-half also happens to agree pretty had, as the wine connoisseurs put it, wingspan, so our 90-inch ship will closely with my personal prejudices. I authority. probably weigh between 30 and 37 feel that the advantages of being much So you see, a case can be made for the ounces. See . . . just by multiplying under 6 oz/ft are usually outweighed by ships at either end of the spectrum, and seven-and-a-half feet by 4, and again by the disadvantages, at least for sport the choice is still yours. I’ve designed 5. we've got some nice solid figures on flying: superlight structures often prove and flown both types in the past, and will paper already! Ain’t Science wonderful? too fragile to take the knocks, and probably continue to design and fly superlight ships can be at the mercy of both types in the future. Floaters and Of course, what we’re really inter­ unexpected turbulence, especially oh penetrators each have their own virtues. ested in is wing loading . . . the number landing pattern. Now I hear what you’re grumbling of ounces that each square foot of wing about, out there: why can't we com­ has to carry. Wing loading is the tradi­ Awright. Now we have a weight range promise, you’re saying. Why can’t we tional "yardstick" for comparing dif­ (30-37 ounces) and a wing loading have both minimum sink and maximum ferent airplanes within a similar size (around 6 to 6.5 ounces per foot) to go in the same airplane? Why does this range. You have to be careful how you shoot for. This tells us we’re thinking Thornburg fellow keep talking about apply the wing-loading yardstick across about a 5or 6square foot airplane, right? floaters and penetrators as if they were different size ranges, however, because If we decide on 5 square feet, however, in two separate worlds? something very magic takes place as a we’ll need to build it light to hit our 6.5 Because that’s the easiest way to think sailplane grows larger. A certain 600- ounce maximum wing loading . . . 6.5 about them, when you’re designing. square-inch plane might be considered times 5 is only 32.5 ounces flying weight. Obviously, what you finally come up a penetrator at 8 ounces per square foot, Can we expect to build a plane with the with will be a compromise of some sort: but when the same airfoil is scaled up to, wing area of a Cumulus and the weight either a floater with (hopefully) some say, 1400 square inches, it becomes a real of a Windfree? Hmmm.. . On the other ability to penetrate, or a maximum-go floater at that wing loading. To get it hand, if we try 6 square feet in our machine that will slow down to at least back into the penetrator class it may formula, then we have 6.5 times 6, or 39 Mach I when you gotta ride light lift. need a wing loading of closer to 11 or 12 ounces, to play with. Now that sounds Your Dream Soarer will fall somewhere ounces per square foot. Engineers dis­ Continued on page 105 on the broad spectrum between the "floater” and "penetrator” extremes. PLANE SPAN AREA WT. O Z/FT1 AR All I’m suggesting is that you be aware Aquila 99 810 40-44 7.5 12.1 of the extremes, and make a conscious ASW-17 132 950 58-62 9.0 18.3 choice to design toward maximizing one Bird of Time 118 1070 42-44 5.8 13.0 of them. If you try to develop the perfect Californian 115 915 40-44 6.6 14.5 compromise, thq halfway machine, the Centurion II 99 618 28-32 7.0 15.9 Cumulus 2800 110 753 54-58 10.7 16.0 true floater-penetrator, what you’re Grand Esprit 134 1100 64-66 8.5 16.3 likely to wind up with is a plane that does Javelin II 134 1005 51-53 7.5 17.9 everything adequately and does nothing Legionaire 140 140 1325 65-74 7.5 14.8 well. There are plenty of those in kit Midwest Hawk 99 590 38-40 9.5 16.6 form at your local hobby shop; why Maestro Mk III 132 990 54-56 8.0 17.6 design your own? Olympic II 99 928 37-39 5.9 10.6 Paragon 118 1080 44-46 6.0 12.9 GETTING DOWN TO FIGURES Sailaire 150 1643 120 10.5 13.7 Viking 118 1200 53-55 6.5 11.6 Let’s suppose you opt for a floater, and Wanderer 72 72 563 22-24 5.9 9.2 you already have a wingspan in mind . . . Windfree 99 555 30-32 8.0 17.7 say 90 inches. Why 90 inches? Well, why Windrifter/SD-100 99 902 40-45 6.8 10.9 not? I’m a little tired of 72 inches, 100 FEBRUARY 1979 49

The Cliff hanger is just the thing for a simple, inexpensive slope glider. The model had been flown quite a bit when this photo was taken, hence the dings. Guess you could say the model has really been through the Renger . . . er, ringer (hope you're in the mood for bad jokest I. CUFFHANGER By LA R R Y RENGER . . . Yes, our "Half-A Scene" columnist also flies gliders! The Cliffhanger is a quick­ building aerobatic flying wing that uses Ace foam wing panels. Right at home in 40 mph winds. • Once upon a time in the happy little the prototype Cliffhanger. Sureenough, worked just fine and Cliffhanger is now a kingdom of Model Builder, there lived a there were trim adjustments required, good flying model. couple of lovely young flying wings. but due to the safe control possible with So what is the end result? Well, Also in this kingdom there was a young a tether, there wasn’t a scratch on the Cliffhanger won’t thermal, that's for (more or less. I'm told) lad who saw them model even though I was flying it over sure; it’s purely a slope machine. But it is and fell madly in love. Sad to say, he was asphalt. It's just a good thing that the fast and smooth, turns on a dime, under a dark spell by the wicked witch neighbors are understanding about that handles high winds with ease, and is nice called "Lazy” , and was unable to reach weirdo on the block playing with his and compact. For sport aerobatics, or his desire. model airplanes in the dead of night. speed on the slope. Cliffhanger is a hot One bright day while sitting at his First flights were not quite so smooth trip. The highest wind yet tried with building board, our hero (?!) came as I hoped, but not disastrous. I had Cliffhanger was a steady 40 mph. This across the fixings needed to overcome trimmed for a very flat, fast glide on the was over a sheer 300-foot cliff, so lift was the dreaded "Lazy" spell. Chanting tether. Experience now indicates that a no problem. I finally had to fly straight “ACEEXPANDEDBEADFOAMMOLDED- bit more "float” is in order. More on this into a bush to get down. Loops and rolls WINGS” under his breath, he mixed a later. were duck soup that day. grisly potion of Parts A & B of a magic About the time I was getting Cliff­ The separate ailerons and elevator 5-minute elixer bought at great cost hanger flying right, it folded in the and this particular mode of construction from the land of Hobbypoxy. At it middle during a tight turn. OOPS! Back yield a really easy-to-build airplane. It’s hammer and tongs, wrapping with to the drawing board for design of a bo'h rugged and repairable. The mate­ cloths of bright plastic and adding completely new center section. Tip fins rials are simple and inexpensive. In the mysterious electronic black boxes, he were also enlarged in the process. New air, this model looks clean and purpose­ had his creation finished in a nonce. construction was quick, as I grafted the ful. Longitudinal trim is smooth, due to This particular nonce happened to be new parts onto the old tips . . . "Lazy” the almost symmetrical wing section. As in the middle of a dark and gloomy strikes again! This time there were no you might expect, it does require careful night, but the wings shown with a luster, special flight problems. The changes CC placement, but since that is already the pinstriping was in place, even a name was proudly emblazoned on one wing! Lo and Behold! It was the "Cliff- hanger” , all ready to fly. Now our lazy lout had a sexy flying wing all his very own. There was one hang-up, a nagging fear that the new model would just flop helplessly end for end when it was thrown over the edge of the local cliff. Fortunately, there is an old trick for checking model stability developed by, of all people, the model rocketeers. A thirty-foot piece of 1/2A dacron control line was tied around the fuselage and run through a small hole drilled 1-1/2 inches from the leading edge in one wing tip fin. Thus it came to pass that around the witching hour last July 4th, I sneaked out into the middle of the street in front of my house and did a “ swing test” to Gluing the leading edges, trailing edges, and spar to the foam wing panels. Note that only the check balance and control settings on center section gets a spar and leading edge; the tips get trailing edges only. FEBRUARY 1979 51 Wing and nose block pinned to building board, ready to start fuselage assembly. Cutout in wing is for aileron servo. Foam aft of spar is cut out later for elevator servo. established, you should have no prob­ panel as shown on the plans. Note that lem with your own Cliffhanger. the 2° for the tip fins is equal to a Cliffhanger has successfully been 5/8-inch forward sweep over the 18- flown under power. A simple flat panel inch wing tip panels when setting up for of 1/8 plywood was epoxied upright to sanding. Sand all panels inverted, then the rear face of the nose block, and a Tee epoxy them together, still inverted, so Servos are mounted with servo tape. Plywood Dee .020 was fastened to it by a couple of that the topof the wing will bestraight. If radio hatch snaps in place. No. 2 sheet metal screws. All-up weight you wish, a bit of dihedral could be was 17 ounces, but it flew well and could added to each tip panel, say, up to 1/2 pushrod underneath the spacer and even be looped! It would be better to inch each. My prototypes flew well even hatch retainer strip. Inset the cable make a socket into which the engine with a droopy wing after repairs. guide tubes into the top surface. Then mount could slide for easy removal and Make the fuselage cutout in the add glass fiber package strapping tape to installation, if you want this alternative. center panel, then pin the panel right top and bottom wing surfaces from side up over the plans with the trailing fuselage to tip at the spar location. Epoxy CONSTRUCTION edge blocked up 1/4 inch. Pin the nose the tip fins in place. Cut the 6-inch strips After gathering the required mate­ block over the plans, then epoxy the of 1/4 X 1-inch trailing edge stock to fit. rials, cut the straight Ace wing section at fuselage sides to the wing and nose and epoxy in place against trailing edge the spar line, then at the leading and block. Epoxy the formers, spacers, and and tip fin. The rear edge should be up trailing edges. Make a single cut for the hatch retainer strips in place. When the about 3/16 inch from a line drawn from spar, and take up the 1/8-inch excess epoxy has set, unpin the model and the bottom rear surface of the airfoil. chord by extra trimming at the trailing epoxy the fuselage bottom on. The Cut the ailerons and elevator from edge cut. Epoxy the spruce strips to the panel runs from nose to trailing edge. 1/4 X 1 trailingedgestock. Cut and fit the spar core, then epoxy the five center Note that you should not yet have cut hatch panel and epoxy the balsa tabs panel pieces together. Both tip panels out foam aft of the spar! Carve the nose under each end. Sand all wood parts only get trailing edges epoxied on. block to shape. such as the nose block, vertical fins, and Carve the center section leading edge to Now you can cut in the pocket for control surfaces, and also eliminate any shape. your elevator servo aft of the spar, set mismatch in the foam panels. Sand the Next, sand both ends of each wing the servo in and cut a channel for your panels gently with 400 grit sandpaper wrapped over a long piece of wood to remove the little molding bumps. Hinge the control surfaces in place with full-length Econokote hinges. Cover and decorate your airplane. Install the radio. Check your CG posi­ tion and move whatever you must for balance, or add small amounts of ballast as required. Set up your control surfaces with about 1/8-inch up and down throw. The bottom aileron surface should have a slight break upwards, and the elevator should be parallel to the bottom surface of the wing. How about that; ready to fly already! If you are the nervous type, try swing testing your model. Tie the line on around the nose, then run it through a small hole in one wing tip. Neutralize your transmitter controls, turn every­ thing on, then turn the receiver off and transmitter off so that your servos are locked in their neutral position. Swing your model around to see how it flies. Little by little, on successive tests, adjust the three control surfaces until your Dr. Jekyll and Mr. Hyde . . . whoops, no, it's just the two personalities of Larry Renger, Cliff­ hanger designer and MB "Half-A Scene" columnist. Didn't know he could get so violent, huh? Continued on page 107

52 MODEL BUILDER FEBRUARY 1979 FULL SIZE PLANS AVAILABLE - SEE PAGE 128 53 Wayne Sakamoto placed 2nd in R/C Power with his Evans "540" Bob Martz and his original design delta, 4-1/2 lbs., O.S. .40, about design. Uses .40 size engine with tuned pipe. Fast! 500 sq. in.. 4 channels. Looked kind of squirrelly in the turns. NORTHROP FLYING WING CONTEST By ELO Y MAREZ . . . Featuring events for both F/F and R/C models, this contest has earned a reputation for being one of the most interesting meets of the year. The '78 contest was no exception. • Orange County, California,stretching and which we unreservedly recommend. from just south of Los Angeles almost all And while on the subject of air shows, the way to San Diego, is well-known for Mojave Airport, with its Reno-type its aviation activity. It is dotted with annual air race, is also next door, air- numerous small airfields, and is also the wise. home of El Toro Marine Corps Air And of course, Orange County is the Station . . . the old Navy blimp base at home of Model Builder Magazine, and Santa Ana that is now a Marine heli­ famed Mile Square Model Flying Field. copter base . . . and Camp Pendleton, This is a nice place for air nuts . . . both another Marine base very busy with big and littleairplanes. And as you might many types of aircraft. Sitting square in expect, the skies of Orange County are the middle of Orange County is Orange not strangers to flying objects, uniden­ County Airport, the second busiest in tified or otherwise. the nation, and home of such interesting In the late 40’s, Northrop Aircraft things as Talmantz Aviation and its most Corporation gave birth to what was interesting museum. Douglas.Northrop, probably the largest flying wing ever and Rockwell have facilities nearby. On built, the YB-49. This was a rather the outskirts, we find Long Beach Air­ successful aircraft for its day. being jet port and Los Alamitos NAS, known for its powered at a time when jet engines Nats contests in years past. We have were in their infancy, and it set some Norton and March Air Force Bases impressive records. It never became an nearby, and the Navy has Pt. Mugu, operational aircraft, possibly for some Miramar, and North Island Air Stations technical reasons, and maybe because it in the area. The homebuilders are appeared at the wrong time. Those were represented in great numbersat Corona, the years right after World WarTwo.and Flabob, and Chino airports. The latter is there were not going to be any more also the home of a terrific new airshow wars. Not even "police actions” , as they initiated in 1978, the "Gathering of later came to be called. It was thought Well-known flying wing sailplane designer, Dave Eagles", which will be repeated in 1979 that we would no longer need a large Air Jones, with his R-2, a version of his Raven.

Bill Evans, designer of the very successful "540" on the right, with Shades of Star Wars! Another unusual Bill Evans design, the a slightly larger "720", left. Lots of Evans' designs at the meet. "Astron". Two channels, .15 engine. Not flown at the contest. 54 MODEL BUILDER "Scim itar", by Bill Evans. Powered by two K&B .19’s with individual throttles, uses five channels of radio, one for nose wheel only.

Tony Nacarato won 1st in R/C Power with his old "Altair 1", 4 channels, K&B .40.

Winner of R/C Sailplane was Rick Norwood. Fuselage comes from an AS-W 15. Force, or new bombers, and thus, the YB-49 faded away. But not its memory. In commemora­ tion, once a year, some lucky Southern California model flying field is host to a Northrop Flying Wing Contest. This year, the place was Mile Square, and the date was November 5. This is not a contest for models of the Northrop design, but for any and all tailless designs, with the exception of rogallos. Hildie Boehme, 9, shows excellent form as she The latter dominated the rubber- launches Stringless Wonder. Placed 4th. powered event for a while, and for one ventional (?) flying wing designs. year had a separate category all to Officials for this event, the 12th of its Only small engine entry. Dave Meyers' Lit' themselves. This was dropped a couple kind, were Carl Hatrak as Chief CD, Bill Plank, with Cox .051. Had engine problems. of years ago in favor of the more con­ Stroman as F/F Chief Timer, Dave Jones for R/C sailplane, and Harry Apoian for R/C power. Entries were a little lighter that I have seen at previous contests, possibly due to the fact that the day dawned cold, gray, and ominous. However, it im­ proved considerably by midday, and some excellent flying was enjoyed by both contestants and spectators alike. The free-f light area is separated from the R/C field, and flying there went on continuously. The R/C power and sail­ plane sites were next to each other, and took turns flying their rounds to prevent any possible frequency mix-ups. A good idea, which worked well! What would impress a flier whose only model competition is R/C Quarter Midget racing? The variety of thedesigns in free-flight, that’s what. Not much variety in R/C. The power class was dominated by Bill Evans’ “ 540” (500 Denise Comley, with brother Chris' "540" model. Denise wants to learn to fly , but can't get Chris to teach her. Any volunteers? Continued on page 100 FEBRUARY 1979 55 Antique Grand Champion of the 1966 Antique Aircraft Association fly-in was N263H, a Fledgling restored by Joe Erales. Restoration is authentic down to the Challenger engine and forged Curtiss-Reed prop. Airplane is now in a museum in Rio De Janiero. Warren Shipp photo.

G Ú R Ý Í S S N 2 C - 1 ~ by PETER WESTBURG · PART ONE ·

• "If it has two wings, it’s got to be countryside, because it was stable and No less than fourteen companies vied good!" . . . William Northrop, Jr. reliable. for the contract, most with modifica­ Few airplanes had two larger wings The Fledgling owed its existence to a tions of civil aircraft. Curtiss won with a than the Curtiss Fledgling, which auto­ 1927 Navy specification and a design trainer it called the "Guardsman” . Three matically makes it a better than good competition for an aircraft capable of XN2C-1 prototypes were tested and airplane. By all accounts it was a good primary and advanced flight training, Curtiss was given a contract for 31 airplane; those who flew it said it was a training in both fixed and flexible trainers to be equipped with the 9- pleasure to fly and ideal for seeing the gunnery, radio spotting, and bombing. cylinder Wright Whirlwind J-5 of 225 hp,

Both XI\l2C-1's and N2C-1’s were powered by the 9-cylinder Wright Whirlwind J-5. Bomb sight and bomb rack fittings have been installed on the all-yellow trainer, but the tail stripes and serial number are missing. Pete Bowers photo.

56 MODEL BUILDER In an effort to improve high speed and rate of climb, Curtiss engineers designed the Fledgling Jr. with 7-1/2 feet chopped off the wings. The Navy also tested the Jr., but performance was no better than the long-wing version. Pete Bowers photo. the same engine that powered the Spirit The |-5 Whirlwind went out of pro­ so well known that both the civil and of St. Louis. duction at about the end of production Navy versions were called Fledglings. The boom in flying following Lind­ of the N2C-1. A follow-on contract for 20 Though it appeared overgrown and bergh's epic flight led Curtiss to expand Fledglings called for the N2C-2’s to be awkward, it was not. Navy test reports its flying school program. Having a equipped with the 7-cylinder J-6 Whirl­ gave it good marks in all categories of contract to produce the Guardsman, the wind. The merger of Curtiss and Wright maneuvers, except in slow or double logical choice for a training airplane was had not yet occurred; Curtiss chose to rolls, chandelles, and falling leafs . . . a civil version of the N2C-1. One hun­ develop its own aircooled engine, and maneuvers normally performed only by dred Fledglings, as they were called, installed it on the civil Fledglings. The 6- fighting aircraft. And, when fitted with were manufactured for the Curtiss cylinder Challenger put out 170 hp and floats, the Fledgling could not easily Flying Service. A handful of Fledglings pulled the Fledgling along at a top of 107 recover from a spin; it was therefore not went to sportsman pilots. mph and a lazy cruise of 87. recommended for training pilots to fly The J-5 Whirlwind, excellent though it The Fledgling, like its namesake, was seaplanes. was, went out of production to make an ungainly looking bird, but it became To be continued. way for an improved Whirlwind. The )-5 cylinders had a bore of 4-1/2 inches and a stroke of 5-1/2, and a displacement of 790 cubic inches. The new Whirlwind had a displacement of 760 cubic inches, but delivered the same hp with 7 cylin­ ders having bores of 5 inches and strokes of 5-1/2. The )-6 cylinder became stan­ dard for all 5, 7, and 9-cylinder Whirl­ winds.

On military Fledglings, a single fixed .30 caliber Browning was installed on the right side ahead of pilot. A Lewis gun on a Scarff Good detail for modelers in this photo of Joe Erale's Fledgling restoration. Most of the metal ring was also carried for gunnery training. parts are from the original NC-263H flown by Assem Joradnoff. Shipp photo.

FEBRUARY 1979 57 Alf -|lölO l ö l | - f l lA C

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Ä v / \ \ | 1 1 · ν < Γ 7 1 1 V * , > > · i - · ■ * · * — V {«··■»») »* · · »·' N2C-2 -GENERAL FUSELAGE ASSEMBLY tutum* tutum* V. COHTftOL ju > m • « » · · « <·*· oiirtolUi ■ WINO H I WINO - Ί " ____ 1 — T- TilfSCOPiC *IOHt * o .» « 1 (■KnDID (■KnDID IT W U lM t WHllLt WHllLt coMpn vXfO tOlHl.fAl) 8ASIC DIMENSIONS BASIC DIMENSIONS

Use a piece of 1 /8 plywood and the edge of the Partially completed tank. One end piece is Completed tank. Squeezing the alligator clip kitchen counter to make the bends. finished, the other is ready to be bent. opens the vent. Let it go, and it’s sealed. head, and try to keep the fuel pick-up in system will only work satisfactorily if: 1) form the tank. A good material for the line with the carburetor. A good tank the overflow line is sealed during opera­ tank is K&S tin, which is usually available capacity for Class II1/2A racing events is tion: 2) the tank is airtight: and 3) the air at hobby shops. You’ll also find the 1/8- 3/4 of an ounce. Due to practical tank bleed and pick-up lines are in vertical inch brass tubing in the K&S display rack. installation reasons, we’re just about alignment. Keep them about 1/4 inch The small alligator clip, which will be limited to a one-inch vertical tank height apart longitudinally. used as an automatic vent shut-off, is in these events. Thus, a 3/4-ounce tank OK, let’s begin by assembling what readily available from Radio Shack or a would be a 1/2 inch wide, one inch high, we’ll need to build the tank. As you can similar store. and 2.7 inches long. (Note: 1.8 cubic see from the accompanying photo­ After deciding upon your tank dimen­ inches equals one fluid ounce.) Such a graph, only very basic tools are neces­ sions, the first construction step is to tank will work very satisfactorily. The sary. The pieces of wood are scrap 1/8- scribe and cut the main body of the tank. only problem sometimes encountered is inch plywood, and are used to bend and The tank in the accompanying photo­ during restarts, due to the long fuel graphs is 3/4 inch wide, one inch high, draw. A tank like that is not available and 1-13/16 inches long. Thus, the tin commercially. So, that means you'll have should be cut to 1-13/16 x 3-5/8 inches. to make your own. Now. don’t throw in (Four sides totalling 3-1/2 plus an extra the jock by saying, "I can’t build a tank.” 1/8-inch wrap-around tab for soldering It’s really quite easy to build your own it together.) Scribe the bending points tank. Why not give it a try? We’ll give a and then simply bend the tank body as few tips, or so-called secrets, that should shown in the photographs. At this help. point, you’ll be ready for the first Since you’re going to build your own soldering operation. This sometimes tank, let’s make a couple of minor causes problems for modelers. Here are changes to the basic tank that will enable a few suggestions for successful solder­ us to shorten it to overcome any fuel ing: Use an iron that generates sufficient draw problems. This will mean increas­ heat . . . 40 or 50 watts. Be sure the tip is ing the width, but the associated hori­ clean . . . file or sandpaper it to expose zontal head pressure problems can be bright, clean copper. Most importantly, offset by building a uni-flow tank. The be absolutely sure that the metals to be drawing represents a typical uni-flow soldered are chemically clean. You can tank. "A ” is an overflow which must be clean them of any oxidation by using sealed after fueling. “ B” is a vent which very fine sandpaper, and then applying should be directed into the slipstream, some rosin-base soldering paste. Do not and “ C ” is the tank-to-carburetor line. use acid soldering flux or acid-core In operation, since the overflow, vent solder. Be sure the iron is hot, and then “ A” , is sealed, air coming into line “ B” apply the tip and the solder simulta­ bleeds into the tank, about a 1/4 inch neously to the metal joint. from the fuel pick-up point, as fuel is Once the body is complete, stand it on drawn from the tank. The carburetor end on another piece of tin and scribe a senses the difference between the bleed Otto Bernhardt's 3rd homebuilt engine, built line around it. This will be the size of an and pick-up points rather than a chang­ about 1937. Inspired by the Baby Cyclone, it end cap. Add an 1/8 of an inch all ing head of horizontal pressure. It is features a sand cast alunimum crankcase and around for tabs, and then cut and bend it especially important to note that this bypass cover held in place with copper wire. Continued on page 111 FEBRUARY 1979 61 PUMPING ° WEBRA .91 By ELO Y MAREZ . . . If you've been having fuel draw problems with your big engine, consider fitting it with a pump. This article deals with the Webra .91, but the technique could be applied to other engines also. The superiority of the fuel pump- tions, and it was not something else no way of knowing the difference in equipped engines is now pretty well wrong with the engine or installation. A crankcase pressures of the two engines, established, in spite of the minor dis­ smaller size tank would be sucked the fuel requirements of the Webra. or advantages of adjusting them, and that completely dry without any problems at the exact capabilities of the pump. If they tend to use a bit more fuel. They are all. vastly different, I really didn't know if currently probably used in the largest Thus, a pump seemed to be in order, the pump would adjust to the required numbers in pattern and scale airplanes, and I started looking around for a quick amount. Then of course, changing the where the reliability and extra power is and easy installation that we could try. carburetor could bring about all sorts of considered to offset the extra cost. As I have a K&B Perry pump-equipped problems of its own. So far, pumper-equipped engines of .61 in one of my birds. I pulled it out for a Armed with that complete lack of displacement larger than .61’s have not quick look-see. It immediately became data, and with the thought that if it did appeared on the market. Neither the obvious that there wasn’t much dif­ work, I still wouldn’t know all the why's older O.S. .80 or Fox .78, or the newer ference between the outside diameter and wherefore’s, I proceeded to cut up Webra .91 have integral pumps. The few of the K&B pump-equipped backplate perfectly good backplates from a K&B pictures I have seen of the O.S. .90 don’t and the inside diameter of the .91 back- .61 pumper and Webra .91. I would show it to be pumper equipped either. plate. Thus, the K&B part could be know what my tach told me. That, and Possibly the designers have discovered turned down slightly, the Webra back- what the engine did in the air, would be that these larger engines have enough plate opened up slightly, and a press fit proof enough. fuel draw capabilities to be more for­ could be achieved. The Perry carburetor Upon close examination, you will see giving of tank placement and changing is a little smaller than the Webra throat, that both backplates taper in very con­ fuel levels. and could be bushed in. veniently; the Webra on its inside But there is always the 10% that NEVER Now if you are thinking that this is a surface, the K&B externally. As it turned get the word! In this case, it was a Webra job for a real machinist, you’re wrong, out, when the outside taper of the K&B .91 that we were trying to fly on a 34- because six munz ago I cudn’t evn spel it backplate and the inside taper of the ounce tank . . . please don’t ask why. It . . . It does require a lathe, and of Webra backplate have been machined would not hold a setting for the entire course, the more experienced the oper­ off, you are almost to the dimensions flight, wanting to lean out during nose- ator, the easier the job will be for him. It required for a press fit of the two. But up maneuvers after a few minutes in the didn’t look all that difficult, so the more about that later; let us now air. There wasn’t much to be done about decision was made to try it. proceed with some instructions for the tank placement, due to space restric­ Agreed, it was all blind flying, as I had quasi-machinist. The professional

Jigs required. The piece on the left is a press-in adapter, the other is Machining the Webra backplate. The solid inside cover and taper are used to hold the Webra backplate during machining. removed.

62 MODEL BUILDER Machining the K&B .61 pump-equipped backplate. The mounting Machined backplate components ready to be pressed together. Pro- ears and taper are removed. cedure is explained in text. shouldn’t need any and can probably the way through, from front to back. Then, it is jig time again. In pressing improve on the operation. With the rather limited capacity of my the pump-equipped part in, it is nec­ My first step, probably because it was lathe chuck, this required a jig, itself essary to press only on the outer circum­ the least expensive part to ruin if things counterbored, to be made. I was able to ference of what used to be the K&B went bad, was to bore out the Webra adapt a piece of scrap from the junk box; backplate, and on none of the pump backplate. This boring has to be done all a short piece of round stock in which components themselves. In this case, I holes were drilled and tapped and to made a push fitting from a piece of which the backplate was attached. Now, threaded water pipe coupling of one being sure that it is perfectly true, cut inch I.D. It is necessary to increase the out the solid front part of the backplate, inside diameter by the thickness of the and remove the inside taper. threads, and to cut a couple of slots in Next, we'll tackle the K&B backplate, the sides to clear the fuel line fittings on which can be mounted in the lathe the pump. chuck. Note that the chuck jaws bear on Most of us have worked with engines the pump body itself, not on the plastic enough to know about press fits, and the or on the backplate itself. Obviously, use of heat for such purposes. But this will not stand foot-tons of pressure, the pump is partly plastic, so using so chuck it lightly, and take fine cuts so heat was out. Therefore, I went the as not to upset the alignment. Disregard opposite way . . . I put the part with the the flats on two sides of the backplate; pump in the freezer overnight, and left they are there to provide piston clear­ the Webra piece at room temperature. ance in the K&B, and do not have any The next evening came the moment bearing on this conversion. of truth. I should have kept the camera In this case, machine off the mounting set-up handy to record the smile of flange, and then the taper. Go carefully, satisfaction as the K&B and the Webra keeping in mind that if you go too far, parts mated perfectly. there is no way to put metal back on. Since I don’t own an arbor press, I Actually, you are on your own here, as it used my drill press for the purpose. The is a matter of feel. Using the bored-out place to stop is when the two inner Webra backplate as a guide, you reduce surfaces are flush. O riginally. I had the diameter of the K&B backplate until thought that if the fit felt too loose after it feels about right for a press fit. Again, starting, I would use a bit of permanent- the pro will take this in stride, but if you type metal sealant, such as the Loctite are going more on guts than experience, “ Stud ‘N Bearing Mount” availablefrom like I was, I can only suggest that maybe a Ace R/C. As it turned out, this fit was so couple of “ Our Fathers” or your favorite good I decided the sealant wasn’t equivalent might help. Anyway, I took needed, but it is something to re­ Pressing the pump-equipped backplate into the member in case of a looser fit. Webra backplate. Drill press is being used as a off metal until the Webra backplate press. Note pressboard block between back- would not quite slip on, but felt like it In case you are not already familiar plates and drill press table. would with pressure. Continued on page 108

All the new components ready to be installed. Sleeve is required to Pump-equipped .91 installed in CB Enterprises' new CB .90 engine install the .61 carb into the .91 case. mount. Engine runs better than ever.

FEBRUARY 1979 63 The Flight Dynamics A-26 Invader mentioned in the text. Unfortunately, just before going to press, we learned that Flight Dynamics has folded and will not be producing this model. We left the photo and text in so that scratch builders might be inspired to build something similar. bugaboo to you. I think that weight and wing area should be the free choice of the designer. Why limit the event until some experimentation has been done by a variety of people? 1 / 2 - a s e m This event would have the same advantages as Mouse Racing: cost is low, - time required is relatively small, most By LARRY RENGER parking lots are sufficient flying space, and the younger modelers can handle • Last month, I suggested a 1/2A carrier at a typical distance from the pivot (4). is the models. event using the “ Blip Throttle" concept the normal wire (3) to the elevator. Naturally, I suggest that the accept­ designed into Cox’s P-51 ready-to-fly C) The other side of the bellcrank has able subjects be limited to scale profile model. The concept has a few advan­ a curved slot (5) (constant radius from versions of actual carrier aircraft. That’s tages; you can take any of the 1/2A the pivot). half the fun. I think that whipping the throttled engines and work up a two- D) A second bellcrank wire (6) ex­ model is unacceptable during the high­ position throttle system driven by the tends forward from the curved slot to speed run, but should be allowed in low bellcrank. The throttle can be kicked the engine’s (8) throttle sleeve. speed, since the throttle is not trim- both up and down. Small variations in E) A bend in the wire and a detent able. model speed come by forward or re­ plate (7) allow the throttle wire to stay in We sure had fun developing the blip- verse whipping. only one of two positions. throttle Mustang, and the model was a The system is simple, and if you look at The way the system functions is that real crowd pleaser when we did demon­ the sketch, here is how it works: the throttle will set in only the high or strations at the Nats and MACS Show. A) First, we have a bellcrank (1) with low throttle positions. When you give a Two throttled planes in thesamecircle is standard 2-wire flying lines (2). very fast, hard up control, the end of the really fun .. . you can play leapfrog! B) On the usual side of the bellcrank, slot hits the throttle wire and kicks it By the way, Ace has a new throttle for over the rib into the next detent. A hard, Babe Bee/Golden Bee/Black Widow/ fast kick of down control will give you low throttle position. The wire is not driven at all in intermediate control positions. The result is a model which flies normally with only two control lines, but can be kicked to high or low throttle, too. I think that a profile fuselage, sheet wing carrier event using, say, Cox Golden Bee R/C engines and no flaps, automatic hooker, etc., would be fun. The hook could be free-pivoting, with a small drag tab to hold it up in high speed, but letting it fall in low. I'd use sand-filled socks, string, and chalk to set up a blacktop flattop. (The USS Mac- Adam?) For ease of construction, you can use a Frank Scott's .020 "Cardcorde" really cap­ 3/32 plywood bellcrank, or get sheet Beautiful etching of the Cox Babe Bee .049, tures the spirit of sport free flight. nylon or styrene if metalwork is a one of the oldest engines still in production. 64 MODEL BUILDER Λ BLIP THROTTLE SYSTEM

THROTTLED (R/C) .049 ENGINE

(I) 8ELLCRANK WIRE TO ELEVATORS

^7) TWO POSITION DETENTS TO HOLD THROTTLE WIRE

QRC series engines which works well. It uses a tapered pin which slides into the venturi. I think this should be a legal FLOATING CARRIER HOOK alternative to the throttle sleeve. Both are readily available systems so no “ experts only" stigma need be hung on the new system. Moving onto a new subject, I received a letter from Bob Kress, who, along with Nick Ziroli, developed the AXIFLO fans. The information is very interesting, so here is the entire text: Dear Larry, My company, Kress Technology, Inc., WOOD SCREW & WASHERS designs and manufactures the Midwest AXIFLO series ducted fans. I have some BRASS TUBE PIVOT clarifying comments regarding your October 78 “ 1/2A Scene” article in DRAG TAB LIFTS HOOK UP AT HIGH SPEED Model Builder. W IRE HOOK First of all, the RK-049 with a TD .049 and a good pod-type inlet puts out 15-1/2 oz. of static thrust at 20,400 rpm on Cox Red Can 30% nitro. The 16 oz. /20.000/ 25% quoted by Midwest was We recently ran some very interesting altitude loss, whereas the jet could. slightly off. The TD used for the tests had flight tests on two Midwest A-4D's, one The prop job was pulling around some one cylinder washer, no inlet screen, with the RK-049 and one with a nose- unnecessary ballast and inlet drag, and no pressure. mounted prop engine. The prop job was which degraded its performance. I have The same TD was tested with a 6-3 ballasted to the same weight as the jet calculated the inlet/tailpipe drag effect prop, everything else constant, and put and still had the side air inlets and to be roughly 35 to 50 ft./min. degrada­ out 18 oz. of static thrust. A variety of tailpipe, which caused some unneces­ tion in rate of climb out of 375 ft./min. 1/2A racing props put out from 14 to 16 sary drag. Both models weighed 31 oz. obtainable with the jet A4D. Thus, the oz. of static thrust when similarly tested. The results were as follows: effect is not large. The jet, while slow on O f course, installed inside the plane, the 1) With racing props, the prop job takeoff and initial climb-out at equal jet loses an ounce of thrust (even with a would just barely fly. We never got it weights, thoroughly outclassed the prop good inlet/exhaust system). clear of the brush at the edge of the at the higher speeds. More nitro will up the static thrust, but field. The new RK-20 fan will be of all I have been concentrating on getting 2) With 6-3 and 5-1/2-4 props, the injection molded nylon to get away from good performance (or the benefit of the aircraft would accelerate to takeoff the complicated construction of the average modeler on mild fuel, so have faster than the jet, had an initial climb- early RK-049 and RK-40 fans. Only six not tested it. The fan has been tested to out at about the same angle as the jet, self-tapping screws are needed to put it 30,000 rpm, so don’t worry about blade but was much slower in flight and could together. stress. not be looped or rolled without serious Continued on page 118 FEBRUARY 1979 65 Two views of Mitch Poling's "Astro Dandy", designed and built especially for the Indoor R/C Record Trials to be held at the IMS Show. Sandra Smith Poling, M.D., is the better looking model in the photo. Astro Dandy has 4 sq. ft. wing area, weighs 16 oz. without motor on-off servo. ELECTRIC POWER By MITCH POLING PHOTOS BY AUTHOR V • Let's take a further look at some of the initially. We’ll go into this a little later; it when the cell is 100% charged. Such a ins and outs of rapid charging the Astro is another bonus when using the Astro charge rate would charge the cell in four Flight way, and continue from last method. Do note that this is assuming, as minutes, which is OK, but once it is 100% month. Take a look at the wiring dia­ usual, that these cells are connected in charged, like a pitcher filled to the brim, gram for a field charger. Simple, isn’t it? series (if they are in parallel, all bets are something has to spill. The battery gets But remember, this diagram is for the off!). hot, then the seals around the top of the Astro charge method, which uses 1.5 What happens if a charging voltage of cell give up. This would happen, I volts per Ni-CD cell for charging. This less that 1.5 volts per cell is used? The guesstimate, for the example I just gave, means six volts to charge four cells charge current is too low, and the cell in about six to eight minutes after the (Astro 020), twelve volts for eight cells will not charge in fifteen minutes. If the charge was started. The result is a cell (Astro 05), eighteen volts for twelve cells charging voltage is less than 1.25 volts that has a top that leaks like mad, or the (Astro 10), and twenty-four volts for per cell, the cells will, in fact, go into top popped off entirely like a pop top eighteen cells (Astro 15 and Astro 25). discharge instead of being charged. I can. I have done this, to my regret, but Check the figures and make sure you know, I prove it now and then because I that does seem to be the limit . . . the understand this, because it is the heart have taps at 3.6 volts, 6 volts, and 12 volts batteries don’t blow up, they just pop on jny charging battery, and every once their top. and core of this type of charging met hod. in awhile I goof and plug the charger Use these numbers and the cells will Remember, this is all based on the into the wrong tap. The ammeter needle Astro technique, which uses no resistors charge smoothly in fifteen minutes, kicks backwards and tries to register in the charge line. If a resistor is used in starting from a current that is six to eight below the zero peg when I try to charge the charge line, the situation is com­ times the capacity of the cell if it is nearly the Astro 05 from 6 volts! discharged (that is, a bout 4 amperes for a pletely different, and this will be talked .500 Ah cell), to a current that is about On the other hand, what happens if a about later. So, the Astro method is equal to the rated capacity of the cell in charging voltage of more than 1.5 volts smooth, easy, requires a minimum of fifteen minutes (again, about .5 ampere per cell is used? The current skyrockets; experience and equipment, and last but for a .500 Ah cell). When I said a smooth at 2.0 volts per cell, it is up to 8 amperes not at all least, absolutely requires a charge, that’s exactly what happens; all on a discharged Astro cell (.550 Ah). charging voltage of 1.5 volts per cell, no the cells get evened up. even though Worse yet, this current does not taper more, no less. That is not a hard require­ some may have been lower than others down, and stays above six amperes even ment to meet, and all the advantages

All the parts required for the do-it-yourselfer who wants to make his Portable charger from parts in photo at left. Uses regular 115 V plug, own battery charger: timer, ammeter, plug, clips, switch. color coded with tape for positive and negative leads.

66 MODEL BUILDER Homebuilt field charger described in text. Note how timer pointer Closeup of back of timer in photo at bottom of p. 66. Note how will engage switch lever. Also has rheostat for resistor charger. long bolt in wheel collar on timer shaft will activate switch lever. catalog of accessories which is worth sending for. The auto charge cord or the alligator clip charge cord are all you need for charging (No. 4001 and No. 4002, list $7.95), but for most of us, the rapid charger (No. 4005, list S29.95) is best because it has a timer and an ammeter, so the charging can be watched and cut off automatically. If you want to make your own charger, the parts are shown in the photos along with two homemade chargers of mine. One is in a lunch box field box, the other is in a Radio Shack plastic box for portable use. The photos show two ways NICAD PACK. C ELLS IN SERIES CHARGE VOLTAGE of shutting off the current with a timer.

6.0 4 . 4 .8 . The simplest way is to servo tape the 12.0 18.0 2 9 .6 . switch on the front of the timer so that 24.0 1 2 14.4« 16. 1 2 2 . the pointer on the timer hits the switch lever and turns it off. If you wish a make this one requirement more than tance and will charge much more slowly. hidden switch set-up, servo tape the acceptable. How long it would take for a 100% switch to the back of the timer and use a There is a postscript to add to all this, charge would only be a guess on my wheel collar with a long bolt to shut off since what applies to electric flight can part, since I only use GE batteries in my the switch. The long bolt serves as the also apply to the radio equipment radios, nor do I know how other brands pointer and is easy to adjust for the right batteries. If the cells used in the R/C would tolerate such a rate of charge. If lineup on the off position. The short stub gear are Ceneral Electric, as mentioned anyone has had some experience in this, shaft sticking out the back of the timer is in the previous column, there is no let me know and I will be happy to pass it just barely long enough to hold the problem at all. and the R/C batteries can on. I do field-charge all my radio equip­ wheel collar, but so far my set-up has be charged on the field up to nearly ment, both the receiver and transmitter held together just fine. 100% capacity in fifteen minutes. Six packs, and have done so for four years My Astro Dandy indoor R/C plane volts would be right for the four-cell with no problems. In fact, I haven’t used hasn’t flown indoors yet, but it has had a receiver packs, and twelve volts would a trickle charger (wall charger) for my lot of flights outdoors. It flies very well be right for those transmitters that use radios for four years! indeed, at about 15 to 20-foot altitude eight cells. If the cells are not General Astro Flight (13377 Beach Avenue, for about five to six minutes. This isn’t Electric, they have more internal resis­ Venice. CA 90291) has a good four-page Continued on page 105

Astro Flight charge cord that connects in auto cigarette lighter. Astro Flight's Rapid Charger. Lighter plug shown, also available Doesn't have timer, so don't forget to unplug after 15 minutes! with alligator clips for Gel Cell or motorcycle battery use.

FEBRUARY 1979 67 PLANE JANE

• Model Merchant, P.O. Box 3792, This review will deal with the Plane PRODUCT REVIEW , by Irving, Texas, is a kit manufacturer with Jane Trainer, kit No. MM121. Plane Jane CHARLIE VIOSCA quite a variety of fine kits on the market. is a sport trainer vvith a high wing. It is a There is something for most everyone. gentle lady with a .15 or a real power­ Racing enthusiasts can go from a 1/2A house with a .25. Wing span is 51 inches, The kit is most complete, with a fine Rickey Rat to two Quarter Midget racers with a total of 500 square inches. Com­ set of instructions and diagrams. You will to the Super Quick 500 Racer to a plete with a 3-channel radio and a .15, it need the usual items, such as glue and Formula One Midget Mustang. These should weigh about 3-1/2 lbs.; with 4 covering material. Building is a simple are only some of Model Merchant's kits, channels and a .25, it should approach 4 thing, even for the beginner, as the and you will be able to read about them lbs. Of course, how you build will vary fuselage is already built, wings covered, in coming product reviews. the weight some. and tail cut. Following the instructions will produce a fine sport trainer. The instructions include how to build the kit with ailerons. Should you choose to make it 4 channels, ailerons add just the right touch for the sport flier and everyday flying pleasure. Let us briefly go through the building steps. Join the wing halves by adding the plywood dihedral brace and gluing the wing halves together. Glass tape the center section. Except for painting or plastic covering, you are through with the wing. The fuselage is most complete. Bolting on the main landing gear, nose gear bearings and wing hold-down dowels is all that is necessary (besides covering). Gluing the plastic cowl halves together. Cutouts for wing and fuselage are made later. Use of Attaching the tail is very simple; mark spring clips from stationary store is a clever way to hold pieces while the glue dries. it as shown in the diagrams and epoxy it

The O.S. .25 Schnuerle used on Charlie's model. When it comes to workmanship and appearance, After wings are glued together, the joint is O.S. engines are unexcelled. Muffler and wrenches are included with the engine. reinforced with fiberglass and epoxy. 68 MODEL BUILDER into place. Add triangular vertical fin bracing and you are complete here. Cut the cowl from the plastic parts sheet and follow the instructions for gluing it together. The tail surfaces are cut, shaped and sanded. Mark them as per the instructions, and glue into place on the fuselage. After painting or covering, you are ready to attach the rudder, elevator, and ailerons (if used). I have built and flown both the 3 and 4-channel models. An EK LRB was used and proved to be just the ticket. One of the accompanying photos shows the radio installation. The brick was used for rudder and elevator, while the ailerons and throttle were controlled by separate servos. The brick is small, light, and powerful enough to control any size model. The SM servos are small, fast and very responsive. All of my EK radios are equipped with the Ni-Cd battery packs, both in the transmitter and receiver. I find the Ni-Cd batteries much more convenient to operate, and while they cost more initially, they are cheaper in the long run. I have had only one radio with dry cells in the transmitter, and The 4 channel Plane Jane in flight. Charlie built both the 3 and 4-channel versions, powered by quickly converted it after crashing an S.T. .15 and O.S. .25 engines, respectively. Both models were flown with an E .K . LR B radio. airplane due to battery run-down. With Ni-Cds and EK ESV, you can tell exactly the condition of the batteries. With the dry cells, you are just guessing. I depend on the ESV to tell me how my batteries are, and so far, it has not let me down. I think all R/C modelers should haveone. Power for the Plane Jane comes from a Super Tigre .15 R/C. This small, reliable powerhouse really does the job. I in­ stalled an O.S. Schneurle .25 in the 4-channel Plane Jane, and it handles more like a pattern ship, very responsive with enough power to haul it almost straight up. The Super Tigre .15 is more than enough engine for training and sport flying, but there is always the flier Plane Jane kit contents. Charlie's models had wings sheeted with balsa, but current kits have Continued on page 103 1/64 plywood sheeted wings. Most of the required hardware is included in the kit.

Radio installation details. The E .K . "Little Red Brick" has performed flawlessly in both of Charlie's Plane Janes. The brick handles the elevator, rudder, and nose wheel. Separate servo is for throttle, aileron servo is in wing. Ni-Cd battery is squeezed in beside brick.

FEBRUARY 1979 69 r

I u

From left to right, the BINGO, EPIC, and new BONE design discussed in text. Note how the BONE on a reach. Note the excessive amount free foredeck area is increasing as the rig moves aft. of twist in the jib. the light displacement decision was made for BONE, a corollary was mini­ mum wetted surface. While the hull sections on BONE are not actually semi­ circles, they are more nearly that thari V or U-shaped. The light displacement decision also led to above-water drag By ROD CARR reduction quests. The freeboard at the transom is only 1/8-inch in still water, ye( • Continuing our look at recent de­ scientific principles, rather than by the boat is so stiff that by the time her velopments in the 50/800 class, we get cutting and fitting bits and pieces from leeward rail isawash.itistimetoshorten our first glimpse of the BONE design. In boats seen at the lake. sail for survival. the lead picture we see the parents and The original BONE (there is a BONE II their unlikely offspring. No. 757 is the already) utilized a rig identical to the The most obvious change from tradi­ tion is the installation of the rudder original production BINGO which won EPIC, in order that improved perfor­ under the bow. The reasons were: first, the Class Championship in 1975. Notice mance be ascribed to hull and stability to place the center of buoyancy, the how near the bow the forestay comes. progress. At the time the pictures were The BINGO was named B-ONE,asthat is taken, the rig was still untuned, yet the center of lateral resistance, and the the first square on a bingo game card. BONE easily kept pace with the two sailplan as far aft on the hull as possible Behind B-ONE is a stock EPIC, No. 1426, other boats in the light air encountered. for improved downwind performance belonging to Bob Harris. Last in the trio This is surprising, since one of the major by preventing nosediving: secondly, by is the new design, named BONE in decisions made when building BONE working in undisturbed water, the honor of her forebearer, No. 757. was to eliminate as much weight as rudder would be more effective and The BONE design is a result of a possible. She tips the scale at only could be made smaller, hence less collaboration between Bob Harris, my­ slightly over 14 pounds. Light air and wetted surface: thirdly, certain tacticaf self, and a design team from Hydro- light boats have been a deadly combina­ advantages can be realized by a boat whose bow steers rather than having its nautics, Inc., of Laurel, Maryland, tion in past designs. The BOOMERANG headed up by Karl Kirkman. The Hydro- and YANKEE are two examples, which stern slide out and around. (Make a nautics folks wanted to apply presently were apparently bothered by relatively couple of mental mark roundings with other boats close by and you’ll see what I available technology to the 50/800 class large wetted surfaces, and hence large and produce a boat designed from drag in light air from skin friction. When Continued on page 120

Transom of BONE is only 1-1/2"deep. Center of Gravity of the There's the rudder, mounted at the bow! See text for logical reason­ whole system is 6" below waterline. Hey! Where's the rudder? ing behind this radical departure from tradition. 70 MODEL BUILDER 44 72 74 88 82 88 78 83 ...... FREE FLIGHT SCALEFREE . . FLIGHTHANNAN'S . HANGAR OT SINGLE STICK PUSHER CONTROL LIN E STORMHAWK PEANUT DORNIER LIB ELLE SHOESTRING/LITTLE M IKE AND Theexcellent constructionSan and Diego, photo workCalifornia, by Bill almost needs Noonan,no caption. This World second second in theWW-I category at a Flightmasters contest. War War I Sopwith Dolphin is in 3/4-inchscale, and recently was fR lLiU G H r ^QA/TROL LlNt ^QA/TROL

FEBRUARY 1979 Larry Kruse's pretty little Morane Saulnier is powered by a Telco Another cutie from Larry Kruse is this rubber-powered Monoprep, CO2 motor. Looks like he's using Fulton Hungerford’s wheels. which flew to 4th place in Rubber Scale at the Nats.

FREE FLIGHT SCALE By FERNANDO RAMOS

• The Flightmasters held its 29th Annual spectively. Scale Contest. This year it was limited to Some of you may think that having 53 only F/F Scale models, with C/L and R/C models entered is a pretty fair number, being dropped. Since the Flightmasters especially for a speciality event like F/F club has been known for F/F Scale, it was Scale. But those of us who have com­ felt that the other two classes should be peted in this contest for over 15 years eliminated. The turnout for this event was realize that this is about half of what it disappointing to say the least. Even should be. My personal feeling is that though we had 53 models entered, it was the Flightmasters for years has had quite the lowest number we have had, to my a reputation for being the most active knowledge, for this one-of-a-kind event F/F Scale organization anywhere, as well here on the West Coast. So rather than as having top-rate modelers. It is my give a blow-by-blow account of the opinion that there are a whole lot of contest, I will let the pictures speak for sport type scale modelers who are themselves. However, I would like to intimidated by this reputation. They feel give my viewpoint as to why the turnout that their chances of winning are non­ was not what it should have been. existent, so why enter? I don’t know how First off. let me preface by saying that prevalent this attitude is, but I do know there were many exceptional models, that it does exist! and in general, the overall quality was We have tried extremely hard to make much higher than in previous years. every contest one that everyone can There were five separate events that enjoy . . . one with the lowest key in could be entered, which included gas, competitiveness. Fun has been the rubber, Peanut. CO 2 , and electric. essence of (his scale event. With this Unfortunately, it seems as though gas is attitude, we are hopeful that those just becoming the least desirable, with only spectating would want to join in the fun. five enteries. On the other hand, Peanut Sure, we have gathered many more was tops, with a total of 23 enteries. contestants this way, but there are still Surprisingly, in electric there were too many who are on the outside look­ only two entries, which was a bit of a ing in. There is always a percentage of “ shocker” , but I won’t voice an opinion modelers who attend meetings regu­ as to why that was the case. Rubber and larly, and attend every contest, but Bill Hannan fiddles with his C O j Farman Mous- CO 2 had ten and nine enteries re­ without a model! To these modelers I tique. Same model got 4th at World Champs.

Joe Tchirgi, well-known scale modeler, readies his ,020-powered Joe's Ponnier on takeoff run. Joe drew his own plans for the model, Ponnier at the 7 8 Flightmasters Annual at Mile Square. flies well. Use of gas engines in scale seems to be declining.

72 MODEL BUILDER Like most Thompson racers, Mike's Chamber Neat Curtiss XP-37 by Dick Seifried was flown maid is a fast, smooth, stable flier. at the Flightmasters Annual. Good flier. ask the question, why? The excuse of only ones confronted with this particu­ being too busy is not enough. The club lar problem. needs your support. I feel that even though there are many Another thought has entered my modelers who do not favor the strict mind while writting this and that is, how judging required by AMA for scale many modelers don’t compete because models (check the number of entries in Mike Mulligan and his Chambermaid. Good they have to have AMA membership? It R/C Precision Scale as compared with model for Thompson Trophy events. is quite difficult to convince rubber and Sport Scale at the Nats), there is a place Peanut modelers that they will have to for this type of model even in the F/F spend $25.00 (I understand that the dues sector. For one thing, if we are to have have increased $5.00!) just to fly their our portion of the Scale World Cham­ Peanuts in a contest. Add to this that pionships, then we need the more AMA insurance is secondary insurance precise type of judging. So, as far as I’m . . . that is, it will cover you only after concerned, I don’t want to see that ruled your homeowners insurance, and with a out of our Annual Contest. From those $50 deductible! Naturally, all of our modelers who still enjoy the building flying sites require AMA membership. I and flying of more accurate and detailed know that the Flightmasters are not the Continued on page 95

Bill Warner's Annular Wing not only flies, it Bill Noonan’s big rubber-powered Messerschmitt 20B spans 52 inches, is bigger than it looks in flies well. Took 1st in electric at Flightmasters. this photo. Bill hand carved all 10 of the model's occupants.

Cliff McBaine launching his rubber-powered 1928 Cessna AW at Cliff's Cessna AW in flight. Model was designed when the minimum Flightmasters Annual. Model was published in MB. Spans 48 inches. span for Jumbo Scale was 48", since reduced to 36".

FEBRUARY 1979 73 "Stormhawk" is one of the most realistic looking sport rubber models we've seen in quite a John Morrill and his Stormhawk. John has an while. Wheel pants, unusual cowl, and eye-catching canopy are trademarks of the design. eye for designing really good-looking models. -^-‘STORMHAWK By JOHN MORRI LL . . . The Stormhawk is proof positive that a sport rubber job can have both good looks and good performance. If your flying field is known for its thermals, better put a DT on this one!

• A green field, a blue sky, warm buoy­ Before we start actual construction, I struction. If you elect to do that, you will ant air, 800 turns and Stormhawk is away would like to mention our structural be adding weight and destroying the for a beautiful two-minute flight. High aims. Stormhawk should weigh in at 90 light, airy look that is the aesthetic above your head, now and then a glint of grams, or 3 ounces, ready to fly; any hallmark of the tissue-covered model. sun off the canopy. This is sport flying at heavier and the glide suffers. My model its best. A throwback to those good old weighs 68 grams, finished, without the I feel that Stormhawk would fly better days . . . what the old timer movement is motor. I am using 4 strands of 1/4-inch with a little more wing area. I would all about. rubber, braided. The motor weighs 20 therefore suggest the wing span be I didn’t want to build an old airplane, grams. increased 2 inches (to 28 inches). This is but I did want to see what I could design easy enough to do, since the wing ribs that would have a 1938 flavor; see if I The fuselage main frame is a truss are on 1-inch centers. The stab need not could rediscover the magic of the construction for light weight and good be changed; it will work fine as it is. If the Golden Era. torsional strength. Sheet balsa sides model dutch-rolls with the additional Stormhawk is performance limited. It could be substituted for ease of con­ wingspan, a slight amount of additional has fixed landing gear, a free-wheeling propeller, a fuselage cross-section, and weight. It follows the 1941 AMA rules quite closely. It was designed to be a good, stable flier, combining good duration model proportions with a full- scale look. Under minimum power, the model makes a fine ball-park flier. Full power turns the model into a high performance airplane. If you are a novice builder or new to stick-and-tissue construction and are saying to yourself, “ I would like to build that model, but it is too complicated,” take another look at the plan. Storm­ hawk is intentionally laid out in all staight lines; there are no compound curves. It thus becomes quite easy to sheet the nose, lay out the stringers, and most important, to tissue cover the model. If you feel the sliced rib con­ struction on the wing and stab is too difficult, by all means substitute solid ribs. The canopy and wheel pants are not as difficult as they first appear, and I will cover their construction later on. Stormhawk's structure may look complicated at first glance, but it really isn't. Sheet ribs can CONSTRUCTION be substituted if you just can't bring yourself to make the sliced ribs shown. Note canopy frames

74 MODEL BUILDER Stormhawk caught just after release for R.O .G . takeoff. The model fairly jumps off the ground on full winds. Model consistently turns in two-minute flights. Photo by Erik Daarstad. rudder area will cure that tendency. wood down around the formers, adding an unintentional scalloped effect. I use FUSELAGE Ambroid for all the rest of the frame The fuselage side frames are built with construction. I feel it is still the best the second one on top of the first one to wood cement for stick construction. Coming in for a landing after a nice flight. Right/right flight pattern. Daarstad photo. assure symmetry. Assemble the basic The top sheeting is put on first. Cut the frame upside down over the top view of piece extra long by a couple of inches. the plan. Add the top crosspieces and plan. Make a 1/32 ply former that will fit Butt it along the top longeron of one inside the fuselage frame. Lash the wire then the bottom. The bottom is narrower side. Let the glue dry. Now bend it over than the top and is indicated by the to the former with thread. Smear the the formers. Use rubber bands to hold it thread with glue, position, and glue the shading on the plan. A small triangular in place. The wood will now be at all template will help you get the angle the former into place. Small triangular sorts of cockeyed angles to the other gussets may be fitted on the fuselage same on both sides. Diagonals are added longeron and end formers. Make sure it between the bottom crosspieces. For­ bottom to attach tissue where the wire covers everywhere it needs to. When exits the frame. mers are next added, being erected the glue is dry enough to hold the wood perpendicular to the top longerons. The The wheels are made in a balsa/ply in place, cut it flush with the top of the sandwich. Discs of 1/32 ply sheet are cut wing saddles, through which the wing other longeron and glue it into place. must slide freely, are cut from 1/32 to the proper diameter. A 1/8sheet balsa plywood. Use a brand new No. 11 Uber Trim the overhang from the formers at disc is glued to either side. A 3/32-inch Skiver blade. Cut the inside airfoil shape each end. The cowl pieces are now hole is drilled for the hub. Get a long first, then the outside contour. The 1/32 added. Bevel one edge at an acute angle (1-1/2 inch) 4-40 bolt and two washers. plywood is very easy to cut using a sharp and cement it on the longeron side. A Put the bolt through the wheel center, a blade. Add the rear stringers; they butt little effort here will produce a perfect washer on each side, and tighten the against ")” and lie on top of "K ” . Place joint to the top sheeting. Use two pieces, nut. Chuck the bolt in a 1/4-inch electric the center stringer first, then the ones on one on each side. Wet the wood, bend it drill. The drill should be held in a either side. The spacing is shown on around and overlap the two pieces on horizontal stand .. . an elementary former “ K” . They are again spaced the bottom. Hold in place with rubber lathe. With sandpaper sticks, true the evenly across where they end at the bands until the wood has dried. Make wheel up and shape the sides. Take the fuselage rear. The lineup on the inter­ one cut longitudinally along the bottom bolt out of the wheel and glue in a 3/32- mediate formers should be automatic. center with a good sharp blade. This will inch diameter aluminum tube axle Finish the rear fuselage with 1/32 sheet, give you a perfect butt joint. Glue the bearing. The wheel pant center with the grain running crosswise. The nose sheet­ wood to the formers and hold in place wheel cutout is made from a piece of ing may now be put on. I use white glue with rubber bands. Trim when dry. triangular trailing edge stock, 1-1/4 x 3/8 for sheeting. As it ages, it doesn't pull the The landing gear wire is bent to the inch. It is sandwiched between sides made of hard 1/16 sheet, glued to the wire, then wrapped with silk, nylon, or in my case, Coverite. Recesses are gouged out for the wire on the inboard side of the wheel pants. The canopy is put on after the model is covered. I used the movie film cement technique. The film cement is available from photographic stores and comes in small 1/2-oz. containers. Cut the canopy frames from 1/32 ply, using a sharp knife. Cement them in place. Using the windshield outlines on the plan, cut heavy paper templates and check to make sure the windshields fit your model. If not, adjust the patterns. Let the celluloid protrude slightly beyond the windshield frames. Next, put several coats of clear dope on all framework where the celluloid will attach. Using small pieces of masking tape, hold the celluloid in position. Do one windshield at a time. With a very fine brush (00000) and finger pressure to hold the celluloid tightly against the Good action shot of John hand launching his Stormhawk. Model has a pretty steep climb angle for a sport rubber job. Photo by Erik Daarstad was taken at Mile Square Regional Park. Continued on page 107 FEBRUARY 1979 75 1/32

1/32 PLY WING SACOLE

3 / 3 2 5Q 1/16 X LONGERONS DIAGOffl

D1HEDREL J.OINER 1/32 PLY

SOLDERED BRASS COLLAR

ALOW TUBE BEARING/ FRONT

BENT W IRE/ BBEAR. 'S' HOOK Cli *CH Pi N WASHER 2

2 4 e s ίο c m i s

76 MODEL BUILDER

Bob deShields displays his 1 /2A Maverick, built from RM kit. Bob is a Closeup of Bob's Maverick, showing how he made the wing hold­ master at trimming models with tissue paper. downs. Fully described in text.

by TOM HUTCHINSON PHOTOS BY AUTHOR

• Well, the first column’s in the hopper 16th round flight in A/2 Nordic at the getting involved to see that this hap­ and the worst part is over, right? Wrong! recent Finals at Taft. pens. It is not too late to correct this You sit here at your typewriter staring “ Jim (a fine fellow and tough competi­ error.” at this nice white piece of paper, won­ tor) had his model involved in a line­ I happen to agree with Steve that the dering how you’re going to do it again. crossing, then länd without releasing Jury made an error. Since Labor Day, the And how you’re going to do it if the from the towline. One attempt down. Jury has convened again and upheld piece of paper stays forever blank. Next try, the model DT’d on tow and their original decision to allow Jim Fortunately, Bob Stalick passed on my again landed without releasing the Wilson 3 attempts. Their grounds for address before turning over the column towline. Two attempts. Next try, he doing this were that contestants were to me, along with a batch of newsletters launched for a reasonable flight that put unfamiliar with the new rule, that line- he’s been receiving. Hope those news­ him second on the team, but that makes crossings were being allowed as repeat letter editors will notice the change and 3 attempts (for 1 flight). attempts throughout the contest at the mail them directly to me from now on. “ It would please me very much if Jim instructions of the event director, that This is also a good opportunity for other was entitled to 3 attempts, but it is very newsletters to put me on your mailing clearly spelled out in the 78-79 AMA list, too. My address is 3255 NW Crocker rulebook that these situations are all Lane, Albany, OR 97321. attempts, and the limit is 2, not 3. The THE GREAT LINECROSSING only grounds for a re-fly of an attempt is CONTROVERSY: A DRAMA UNFOLDS if the model is involved in a collision, Last month, I described some of the either with another model or with a ways the new FAI linecrossing rule person, while being launched. affected Nordic flying at the Taft FAI "Clearly, the Jury disregarded the Finals. Now, let Steve Helmick make rulebook by which all of our contests are some comments about one incident that operated, and by which our team was to may change the membership of the U.S. be selected (according to the contest­ Nordic team: ants' information packet). The results "As a concerned participant in the FAI are that all the program participants are Free Flight Team Selection Program, I cheated, and the honesty and fine feel compelled to write and express my sportsmanship in our hobby are in disapproval of the way in which the FAI serious jeopardy. Our teams must be Bob Sifleet checks his Power model before Jury gave their blessings to Jim Wilson’s selected by the rulebook, and I am flight at Taft FA I F/F Finals.

You supply the caption for the expression on Steve Helmick's face. George Schroedter, of Champion Model Products, poses with the He drove 1000 miles from Seattle to Taft, and it's RAIN ING! Champion Coupe he's kitting. Kit goes for $13.45. More info in text.

78 MODEL BUILDER this interpretation was commonly un­ derstood and accepted by the contest­ ants and timers, and that they felt that consistent application of this (wrong) interpretation for the entire contest was an overriding consideration in their decision. Well, folks, I find the Jury’s reasons incomprehensible, for these reasons: 1) The linecrossing rule has been in effect since 1976 and has been in the AMA rulebook since then. I read the rulebook before and during the contest, and most of the fliers I know understood what the printed word said. John Len- derman said all teams were briefed on the meaning of the rule at the 1977 World Champs. Jim Wilson had been involved in at least 2 previous line- crossings, and should have known the content of the rule. 2) The event director was familiar with the rule and did not universally allow reflights of attempts after line- crossings. I had a linecrossing on the 2nd day, and when I went to get a timer for my next try, the ED (Ross Steckel) of us expressed dissatisfaction with the receives a zero score. specifically told me that this was an current linecrossing rule, both because "The major fault of the current rule is attempt and I was now trying for a 2nd of the controversies over the rule at the in dealing with linecrosses that result in attempt. Based on my one experience Finals and the genuine possibilities for the model being towed into the ground. with a linecrossing incident, it is hard for inequity. Jim Thornberry wrote the When the original rule was written, all me to see how the Jury could conclude following analysis of the rule and a towhooks were of the kind which re­ that attempts being repeated after a possible solution for the inequities: leased the glider when the line went linecrossing was a universal occurrence. "Most flyers would agree that the slack. Thus, a linecross would result in 3) Even assuming that the contest purpose of collision and linecrossing either a premature release or a normal management was going to allow a devia­ rules should be twofold: towing. This is no longer the case with tion from the written rules, they should 1) A flier, who through no fault of his the circle towhooks used by the majority have notified all contestants that they own, becomes involved in a collision or of fliers. These hooks do not release were going to do this, before the first linecrossing that results in his model when the towline goes slack; instead, round of the contest. They did not do being towed into the ground or being they release at a very high line tension this. Apparently, they did not even released prematurely from the towline that is not reached during normal tow­ notify the event director; he was still should not be excessively penalized. ing or a linecrossing. True linecrosses sticking by the book as late as the last 2) There should be some incentive to now usually result in the model being round of the 2nd day. avoid collisions and linecrosses; cer­ towed into the ground or a return to tainly there should be no tactical advan­ normal towing. Jim Wilson flew a very good contest tage gained by letting one occur. and would make a good team member. "The current rules regarding colli­ It would be a shame to have him elimi­ "Writing rules that carryout the intent sions do not deal adequately with a nated from a high placing because of a of these 2 statements is not easy. The collision between a model under tow mechanical failure. But such failures current rules attempt to satisfy the first and a model in flight. The model under happened to others, too, and kept them statement by allowing a flier involved in tow might be able to repeat its attempt, from a place on the team. It would be an a linecross whose model is then released while the model in flight must take the even bigger shame to take a place on the within 60 seconds to accept this flight flight despite the collision! (Only colli­ team only because of a favorable misin- after it is timed or to use his second sions with other models or persons terpetation of the rules by the Jury. attempt in the hope of getting a better qualify for a re-fly.) Similarly, an in-flight A POSSIBLE SOLUTION flight. The rule offers no recourse to the model colliding with a towline must take After coming back from Taft, several flier who is the victim of a linecross on the flight despite the collision caused by of the Northwest FAI fliers gathered to his second attempt. If he is towed into another flier. The current collision rules discuss how to do better next time. Most the ground by the linecrossing, he penalize the in-flight model which

Liz Sanford (center) won P-30 at Dallas Southwesters meet, flanked The 1977 Taft FA I Semi-Finals was the 2nd Semi-Finals in a row that by Bill Baker (3rd, left) and Roger LaPrelle, 2nd. George Beaver photo. Don Zink posted a perfect score in A/2. Photo by Pam Koontz.

FEBRUARY 1979 79 MODEL BUILDER George Xenakis, with aid of son Greg, awaits indication of rising air Jim Wilson, foreground, awaits start of 8th round at 7 7 Semi-Finals, at '77 Semi-Finals. He made it to the Finals. Pam Koontz photo. Jim qualified for U.S. team at 78 FAI Finals. Koontz photo. collides with another flier's model the rules (changed or added words in model undertow may not, thus discour­ under tow or his towline. (The previous italics): aging towing near an in-flight model. rules did not.) A) change Definition of and Attempt B) Incentives to avoid linecrossing: “ While it may be impossible to write to read: ‘e. during towing the model or 1) A linecross on your first attempt perfectly fair and concise linecrossing launching cable collides with another may force you to take your second and and collision rules, some further im­ model on tow or launching cable (line­ possibly last attempt. provements seem indicated. These crossing) and the model is released from 2) The shorter timespan (30 rather would include the following changes to the cable within 30 seconds from the than 60 seconds) may help prevent moment of collision or linecrossing.' tactical linecrosses to 'try out' some air B) Change the paragraph beginning, for a max or ‘fly down’ from full towline ‘An attempt may be repeated . . . ’ to length for a repeat second attempt.” read ‘An attempt may be repeated when Jim has submitted these rules changes the model in flight collides with: a. to AMA and the FAI Committee for another model in flight or on tow, b. a possible inclusion on the CIAM agenda launching cable, c. a person while being this year. launched, or d. the attempt is the second MODEL OF THE MONTH attempt and there is a collision between One of the most successful of the new 2 models on tow or a linecrossing after events is the P-30 class. John Ferrer’s which the model returns to the ground “ Gully III” was the first P-30 to max out without release of the cable within 30 iri competition. The 3-view and com­ seconds or the model is released from ments by John are taken from the Bat the cable within 30 seconds from the Sheet, which took them from Bugs' moment of collision or linecrossing.’ Buzz, voice of the T-Bugs: "The 2 purposes ot linecrossing and “ The attached 3-view is of my P-30 collision rules are now better met: design, somewhat unorthodox in that it A) No excessive penalty: uses a relatively weak motor and must therefore be built very light. Gully I, 1) A flier towed into the ground or which is not shown, has a 3.5-inch wing prematurely released due to a line­ chord and weighs about 33 grams with­ crossing on his second attempt may now out the motor; however, it is a good repeat the attempt. backup ship. Gully II was carried away by 2) Collisions between 2 models under the thermal gods and, although re­ tow or between an in-flight model and a trieved 3 weeks later, it has been retired. towline or model under tow are now Light planes also have their problems Irv Aker launches Wake at 7 7 Semi-Finals, specifically covered. The in-flight model coming.down . . . so, the new type DT failed to qualify for Finals at Taft. may now repeat the attempt while the for Gully III. It works great! “ It is my opinion that P-30 will become a difficult event soon unless a weight rule is added. I would like to see the event attract the novice or those afraid of the carved prop, but if expert building techniques are required for light air­ craft, then we will lose many a potential flier in this event.” CHAMPION COUPE You may have seen their ads in the NFFS Digest, but the picture should give you a better idea of what the Champion Coupe looks like. I didn’t know who was behind the product until I renewed my acquaintance with George Schroedter at Taft. George was a real active flier with the Max Men in the 60’s, and I remem­ ber him wiping out the field with both his gas models and this Coupe. Kit costs $13.45 with shipping from Champion Continued on page 102

FEBRUARY 1979 81 "The Navy has two airships, but only one set of helium." Fernando Ramos shows his dedication to • The above quote, by Will Rogers, was Races of 1931. In addition, she held the SCALE with his license plate. Strangely, he is holding a non-scale Sig Uncle Sam biplane! almost literally true during 1924, when women’s speed record of 214.9 miles per the remark was made. Abstracted from hour, set in a Gee Bee Sportster. Robert the races. At New York, he refueled, the article “ The Decommissioned U.S.S. Granville, the only surviving member of including the never-before-filled fuse­ Los Angeles", featured in the Summer the brothers, Howell Miller, and Bob lage tanks alongside the cockpit. Trying 1978 American Aviation Historical Soci­ Hall were all part of the crew which to take off, Thaw could not get the tail up ety Journal. This prestigious publication designed and constructed the early Gee to flying attitude, and after several tries, is devoted to all phases of U.S. aviation Bees, (lust before going to press, we quit. Hall jumped into a plane, flew to history, and is only one of the benefits received a note from Bill that on Novem­ New York, drained the racer’s fuselage available to members. If interested, ber 9, Robert H. “ Bob" Granville bad tanks to get the CG forward, and went contact AAHS, P.O. Box 99, Carden passed away. Always a supporter of on to Cleveland, where unfortunately, Grove, CA 92642. modeling activities, he had served as the ship put in a disappointing GEE BEE CELEBRATION caller for Henry Haffke during two performance. Robert Granville, Henry Haffke, and major R/C meets. Our heartfelt condo­ Hall later went on to work for Stinson, Tom Nallen were kind enough to fill us lences to his relatives and many close where he contributed to the Reliant in on the Springfield Science Museum friends, wen) Taperwing design and some of the gathering, held in honor of the Golden A remarkable array of artifacts was trimotors. Then he joined Grumman Age of aviation in Massachusetts. Present donated to the museum for the cere­ and was involved as a test pilot on many were many celebrities, including Maude mony, including Robert Lambert’s well-known types such as the "Ducks” , Tait Moriarty, Robert Granville, Howell “ Zeta” , a number of models, the Lowell Gulfhawks, Skyrockets, Wildcats, Hell­ Miller, and Bob Hall. The keynote R. Bayles Memorial Trophy, the Charles cats, and Bearcats. According to Hall, the lecture was delivered by Walt Boyne, “ Speed" Holman Trophy, the Niagara cockpit layout of the Bearcat was directly Curator of Aeronautics at the Smith­ Trophy, and hundreds of photographs. based upon that of Kurt Tank’s Focke- sonian. About 150 of the latter were shown as Wulf 190! slides by Tom Nallen and Ron Harrison. Maude Tait. of course, was the winner All-in-all, a wonderful tribute to a of the Aerol Trophy at the Cleveland Air Of particular interest to model builders pioneering group of aviators, and a treat present, were the recollections of Bob to those able to attend. Hall, regarding the Springfield "Bull­ AND SPEAKING OF RACERS dog” . He described it as being very Some time ago, we reviewed Tom much like some women . . . "it looked Foxworth’s remarkable book, "The fast but wasn’t." Russ Thaw flew the Speed Seekers” , a magnificent tome aircraft out of Bowles Airport to New Continued on page 99 York, with little time remaining before

Zona Appleby, of Antique Aero, who con­ structed the full-size Fokker Triplane in the background, displays her affection for Max New knot invented by Dr. Edward Hunter, a Holzem, who was a German fighter pilot retired British physician, is just the ticket for during WW-I. Small rubber-powered models Closeup of Max Holzem's tic tac, several times those whose rubber motor knots always seem were flown for "comic relief" during fly-in at actual size. Max was a test pilot for Pfalz, and to come undone (usually while winding!). See Flabob Airport, near Riverside. this was the company emblem. Newsweek, Oct. 30,1978, p. 105, for more info. 82 MODEL BUILDER This month's Peanut can be built either as a CO2 or rubber-powered model. The CO2 model will consistently do two minutes outdoors, but the rubber model is limited in flight time because of the small prop. Both models had severe flight problems that were solved in a clever way . see text.

By WALT MOONEY . . . This month the professor presents a two-for-one model; a neat little Dornier flying boat that can be built either for rubber or CO2. Naturally, both are excellent fliers. • In ihe early Twenties, Dornier de­ signed and built a little three-place flying boat. It had simple lines and looked like an excellent design for a small model. This inspired the two models presented here. It can't be said that these models flew right off the drawing board. They didn’t. In fact, both of them had identical terrible problems which took a little test flying to solve. Solving the problems became a chal­ lenge, and the challenge was met so successfully that the CO2 model has consistently flown for 80 seconds in­ doors (we flew it in front of Model Builder's illustrious editor and a batch of Three-quarter rear view gives a good idea of the strut arrangement. Vertical stab on rubber other witnesses at the last Peanut Proxy model must be strong to withstand the pull of the motor. Contest). It will do 120 seconds or more second flight is somewhat disconcert­ causes a tight right turn under power. every lime outdoors in smooth, stable ing. It took about a quarter of an inch of Sidethrust adjustments were tried, but flight. The rubber-powered model has left rudder deflection to overcome the even very gross angles weren't suc­ also been adjusted into a stable flier, but right turn, which obviously wasn't the cessful. its flight time is fairly short because the answer because the gliding flight be­ The cure: Straighten out the slip­ propeller diameter is somewhat limited. came as terrible to the left as the pow­ stream below the wing. How? Well, Since you have been told there was a ered flight had been to the right. there is no exactly scale way, but there is flight problem originally, a description a way that can be almost invisible and The cause: The propeller slipstream of the problem, its cause, and its cure is certainly no detriment to the looks of in order. which moves aft in a swirling motion hits the models. Install a couple of flow The problem: On early test flights, the rudder, but only the bottom half of straightener vanes below the wing, aft of the swirling slipstream hits the rudder; both models spiraled in to the right, very the propeller. Simply fill in between the sharply. The radius of the spiral was the top half passes above it. Since only forward and second cabane strut on about three feet. To have a model hit the part of the propeller blast hits the each side with a sheet of thin transparent ground at your right ankle after a two- rudder, there is a sideforce on it that plastic. These panels keep the flow from going sideways and force it to go nearly straight back over the vertical tail. . . and whaddayaknow. the problem is solved. Compared to solving the flight prob­ lems. building the models is very simple. Most of the building methods are the old standards. Assemble the parts over the plans, using balsa for all the major structural components. The powerplant installations are the major nonstandard efforts. To have a reasonable rubber motor length requires an open ended nacelle and a strong vertical tail to support the rear motor book. The nacelle is assem- Hull and sponson strakes are added after the hull has been covered and doped. Celluloid air­ flow straightener between front and 2nd cabane struts is just barely visible on model on right. Continued on page 109 FEBRUARY 1979 83 1 / 1 6 BY 1/4 LEADING EDGES-7 1 / 3 2 SHEET FILLER BETWEEN ROOT^? Γ

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FEBRUARY 1979 85 Bob Autry turns loose his fast Big Goodyear model, pulled by K&B The unduly Ron Duly with his Big Goodyear, just before wipin' 5.8. Knee pad lets Bob know which knee to put down in pit stops. 'em out in a 500-lap final.

By "DIRTY DAM" RUTHERFORD ontrol line PHOTOS BY AUTHOR UNLESS NOTED

WATCH OUT, GAGER!! existence, even on the mild 35% fuel that years ago, Terry Prather converted a As mentioned last month, there is talk used so far. Maneuverability is what you VooDoo to R/C and flew it somewhat of a challenge between myself and MB's would expect from a Combat plane successfully. And perhaps Terry isoneof Pylon Freako, Jim Gager. The form of the turned loose . . . the faint of heart watch the very few who can visualize the challenge has not taken shape yet, but from the relative safety of the airspace performance of Gary’s R/C Nemesis, as searching about for a suitable model to between their car and the ground. Terry used an engine not as powerful as use in such a confrontation hasoccupied Unfortunately, last weekend the a current Fox, an airplane that is both about 38 seconds of my free time. motor mounts broke loose during a heavier and smaller than a Nemesis, and Quite by accident, one of the other flight, the model immediately blowing controlled by a heavier and slower radio members of the Jive Combat Team, Gary itself to bits. After looking for 2-1/2 system. Stevens, has come up with the answer; hours, Gary did find the motor and most And surely Terry will be interested in an R/C version of the C/L Combat of the radio, leaving only the battery knowing that Gary hand-launched the design by Howard Rush, the well-known pack someplace in the weeds. R/C Nemesis, model in one hand, Nemesis II. Gary slipped his RS radio So now we have the model to use in a transmitter in theother. .. very exciting. (two-channel) into a Nemesis that had challenge; a Combat plane that can be BACK TO "PURE'’ C/L first been used in C/L Combat (it had at fitted with either a 15, 36, or 40, and can As this is the usual time of the year for least two wins in Combat to its credit). also be set up to fly either on lines or building and looking forward to the The stock, full-size stabilator was used, with radio, conversion to either R/C or coming flying season, let’s talk about but with an extra-long control horn, and C/L configuration taking about an hour what you are going to build, and why. tapered ailerons were hinged to the or so. But first, let’s assume that you are new trailing edge of the wing. The ailerons go Your move, Jim .. . to the hobby, or have been involved for to the tip, extending in to the twin HI THERE, TERRY awhile, but are considering going dif­ booms, so are almost full-span. Gary and I are both aware of the fact ferent directions this year. For power, a very strong S.T. X-15 was used, mounted way up front to get the balance right. Fuel feed was the usual bladder, filled with nasty medicine. The added weight of the radio was more or less offset by the fact that there was no drag from the lines to slow the model down. Performance was, uh, just a bit much. Not as fast as a Formula I, but considerably faster than a Quarter Midget. Gary and I met during last week to play with his new toy. Neat, but then we discussed the interesting possibilities of bolting on a honkin' Fox 36 Combat Special... So we did. And you ought to see this hummer fly. Vertical performance, from a hold-it-out-and-drop-it- launch is limited only by the fact that it goes out of sight very quickly. Top speed is easily From left to right, Darrel Albert pretends to be flying T R , Carrie Briggs tries to be seven feet faster than any Formula I currently in tall, and Dave Braum believes a 15° list is good for 10 mph. 86 MODEL BUILDER The first question to answer is whether or not you should even fly C/L. And I feel that the answer has to come from looking around you, as even I don’t advocate that C/L flying is for every­ body. If there is absolutely no C/L flying in your area, why bother . . . there are many other forms of modeling to get involved in. Of course, if you are a die­ hard fan of C/L, and enjoy the promo­ tion of it. C/L modeling is still very attractive to most everybody who is modeling oriented, and just a little promotion, plus lots of active flying, will find the flying areas full of like-minded people. But if you simply want to participate in an established form of modeling with­ out the promotion effort, look around and see what is going on. And I really mean look. Quite often an area will have a very active group of C/L, R/C, and F/F people, but they might be difficult to track down for one reason or another. As an example, my area seems to be very modeling oriented, yet it is not difficult at all to find modelers focusing on their own likes, not even aware of the very significant activities going on around them in F/F, R/C boating, R/C cars, C/L (both sport and competition), On left is Doss Porter, right is Sonny Butler. Doss is probably telling Sonny that he doesn't indoor flying, etc. In the named cate­ have enough ribs and that the pushrod will flex. And he's right on at least one. gories, we have sufficient interest and When you have finally determined same materials, the only real distinction competition to come up with National what is going around the local area, all is in the method of controlling the Champions, even a couple of World you have to do is decide which faction to models. As the magazines take a lot of Champs, plus several writers of ques­ go with. space going on and on about the virtues tionable abilities. But as this is the C/L column, let’s say of R/C flying, let’s look at C/L from the The point is that when searching out that your choice is between flying sport method-of-controlling-it side of things. activity in a certain branch of modeling, R/C, with maybe some Fun-Fly (Dumb- First off, it is a lot cheaper to buy a few you have to look pretty hard sometimes, Fly) competition thrown in, or going sets of lines, a card of bellcranks, some and even asking modelers at a local shop with a crowd of C/L fliers who are into leadout material, and assorted C/L flying may not get you pointed in the right both sport and competition flying. handles than it is to pop for even the direction. Better to check with several most basic of radio sets. shops and to ask the shop owners about As both groups are into modeling, and But just because it is cheaper doesn’t the various activities going on. the models themselves are built of the Continued on page 106

On left is Joe Kail, right is Johnny Clemens (who?). Joe's Kilsdonk Mike Hoffelt with the FA I Monoboom, which he kits. Also has an designed Zipper got him a 1st place at MACS Show. AMA (Fast) Combat version Both are state-of-the-art.

FEBRUARY 1979 87 found a very detailed plan of Shoestring, but Little Mike showed up in an ancient issue of Air Trails, in a tiny three-view with a wingspan of roughly two inches. To scale up any plan, divide the desired model wingspan by the wingspan of the available three-view. The resulting constant number is entered into the memory of the calculator. From that point on, scaling up consists of taking measurements of the three-view and multiplying them by the constant, yield­ ing the desired dimension of the finished model. DESIGN The three-ply fuselage construction was chosen because the rules required profile construction, and we wanted to duplicate as many of the fuselage con­ tours as possible within the limits imposed by the rules. Also, our wood box contained a few sheets of 1/16 “ iron- wood" left over from the last time we The authors with their 1 /2A racers, all powered by Cox Black Widows. Little Mike in center was bought a kit. The core of soft six-pound built when incompatible paints on first Little Mike (right) ruined the finish. 1/8-inch balsa with hard 1/16 sheet faces gives a good combination of strength and lightness. If you wish to keep the appearance as close to scale as possible, SHOESTRING k s »5 the engine cutouts shown on the plans are recommended. However, if strength AND and practical considerations are more important to you, we suggest that the portion of the fuselage above the engine be eliminated, as it is rather fragile. HH« LITTLE MIKE Observe from the photos that Shoestring accomplished this job for us. By JAMES and DAVID O'REI L L Y . . . Two attractive models de­ signed for 1/2A Scale Racing. A good fun event for clubs. CONSTRUCTION The wing is made from 1/4-inch • Shoestring and Little Mike are 1/2A but decided to play the game regardless. medium-weight balsa. If you are using Class I Scale Racers. They were designed We attacked our supply of old magazines balsa in three-inch widths, you will have for a building and flying contest conduc­ looking for Goodyear and Formula One to splice by butt-gluing. If you are able ted by the Wichita (Kansas) Wichihawks. designs. I chose Little Mike because of to find six-inch wide balsa, you will The purpose of the contest was to keep its pleasing lines and attractive but discover that the splicing has been done the activity level up over the winter. Our reasonably simple color scheme. Mean­ for you. Carve and sand the wing to a rules specified that only reed-valve while, my fifteen-year-old son, David, symmetrical airfoil shape, as shown on radial tank-mounted sport-type engines had also become interested in the the plans. For the least drag, the trailing were permissible. While the AMA rules contest. He considers Shoestring the edge should be thin and sharp. However, at the time allowed "any sport-type 1/2A world’s only aircraft. All the rest are just such trailing edges are very damage- engine” , they were changed for 1978 to planes. So his choice was made. prone, so a compromise is in order here. coincide almost exactly with the rules We began by scaling up the plans. Being rather conservative by nature, under which Shoestring and Little Mike One of those small pocket calculators David and I both left ours somewhat were designed. with a memory isinvaluableforthis job if blunt, anticipating that we would need I fly more free flight than control line, you want to “ roll your own” . Dave the added ruggedness. Before mounting

i - w - ■ - 1.·.« . ■i.-y.-m ««·- i.® > « μ - ei, ».i wa* n. rwiuMi · ————~ -V·*·» jwvrt .* Dave's Shoestring with the flight landing gear installed. Note that The senior O'Reilly's Little Mike. Model uses the sheet aluminum the fuselage extension over the engine has broken off. landing gear and engine mount shown on the plans.

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p a o h a r d / j OG3 MAPO ALUM SHOESTRING GEAR LEG BEND OVER,- PAO/US r SLOT FOR STAB o v e r e ED GE O F 'S OUTBOARD ENGINE MOUNT n o INBOARD ENGINE MOUNT ■ 0G3 ■ HARD ALUMINUM o e NOTE HORIZONTAL GRAIN IN RUDDER / \-±OIA MW TAILSXCIO OeSKiNED 3Y DAVID OBEILLY CO FEBR U A RY 1979 FULL SIZE PLANS AVAILABLE - SEE PAGE 128 00 THE SECOND ANNUAL CONSUMER TRADE SHOW JANUARY 6 & 7,1979 Pasadena Center, Pasadena, California HOME OF THE FAMOUS ROSE PARADE & ROSE BOWL SEE THE LATEST PRODUCTS AND VISIT WITH MAJOR MANUFACTURERS AND DISTRIBUTORS OF: • MODEL AIRCRAFT * · MODEL ENGINES • MODEL BOATS r \ P * ( V W V · RADIO CONTROL SYSTEMS • MODEL CARS V ? * · MODELING ACCESSORIES INDOOR AND OUTDOOR DEMONSTRATIONS STATIC DISPLAY COMPETITION IN MANY CATEGORIES SEE HISTORY’S FIRST INDOOR R/C RECORD TRIALS OVERSEAS EXHIBITORS CORDIALLY INVITED INTERNATIONAL MODELER SHOW. BOX 127. COSTA MESA. CA 92627: (714) 548-4700 the wing in the fuselage, note whether place with Titebond. For fillets, we used whatever, but add a lot to the appear­ the wood on one side or the other is Hobbypoxy Epoxylite, but any suitable ance. Obviously, if the model is being denser. Make certain the heavier tip is fillet putty would suffice. Shoestring's built only to fly, they are optional. Dave installed to the outboard side. stabilizer is installed by cutting a slot big and I each built two sets of landing gear; The fuselage may now be laminated. enough to pass the stab without the a display set with pants, and a flying set Note that the soft 1/8 sheet used for the elevator. On Little Mike, the vertical without. For engine mounts, the plans core has vertical grain, except for areas surface is cut off even with the top of illustrate sheet metal. Note from the like the front airscoop, which projects where the stab will be. The vertical is pictures that Midwest nylon mounts horizontally. Also, note that Shoestring’s then notched further to accept the stab. work well if they are suitably cut down. rudder has horizontal grain. The hard After the stab is glued into place, the top For the control system, there are several balsa fuselage faces have horizontal part of the vertical is glued back into suitable pre-packaged horns and bell- grain. The three layers should be lami­ place. cranks. We used Goldberg's. The bell- nated with Titebond or equivalent, and The landing gear legs are made from crank is mounted on a piece of 1/16 care should be taken to see that excess .063 aluminum. It absolutely must be a plywood, 1/2-inch square. The plywood cement is not squeezed out into the area hard alloy. See your local surplus store mount is set in flush with the lower along the bottom of the canopy, head­ for a suitable material. Generally, the surface of the wing, in the position rest, and fin. Any excess cement alloys sold in your neighborhood hobby shown on the plans. It is epoxied in squeezed out here will have to be shop are neither hard nor hardenable. place, as it takes the entire line pull in picked out later. It will not sand out The legs may be bent by clamping them flight and must pass a five-pound pull without damaging the surrounding along the bend line in a bench vise. test. We did not use conventional lead- balsa. The freshly laminated fuselage is outs. Instead, we used the single loop of placed between two flat boards with However, this will leave unsightly tooth music wire illustrated on the plans. The weight on top until the glue dries. marks along the inside of the bend. A lines are run through this loop and much better procedure is to make a The horizontal stabilizer is cut out of attached directly to the bellcrank. This is bend block from steel or aluminum a little less trouble and a little lower drag. medium or harder 1/8-inch sheet. Note plate. One edge of the block must have a that both models have an elevator on Before the finish is applied a 3/32-inch straight edge which is carefully radiused dia. hole should be drilled into the only one side. Small injection-molded and smoothed. The part to be bent is nylon hinges are more attractive than outboard wingtip and about 1/4 ounce clamped in the vise along with the bend of lead shot should be forced into the fabric hinges, but fabric hinges are more block, in a position such that bending durable, so take your choice. The plans hole. A wooden plug glued into place will occur over the radiused edge. completes the installation. show cut-down Klett hinges. Install Bending is accomplished by driving the them with nothing less than epoxy. landing gear leg by means of a wooden FINISHING The model is assembled by carefully "driver” and a hammer. The wooden For finishing, we used epoxy paint sawing out the cutout in the fuselage for block is positioned next to the bend line (almost) all the way. I did not originally wing and bellcrank clearance. The wing such that the force is applied as close as set out to build one flying model and is then set into the fuselage at an exactly possible to the bend. one display model. The flying model right angle and is securely glued into Wheel pants serve no useful purpose resulted when we tried to finish the first 90 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER model with butyrate-based sanding sealer with epoxy over this foundation. The friction from sanding would heat up The ‘Ultimate Finish” the local area and it would promptly grow a bubble! After the fourth or fifth attempt to cut the bubble out down to the bare wood. I decided, reluctantly, that I had just made a good flight model and had better get started on a display version for the building contest. The second time around, we used white epoxy filler coat to fill the wood grain and finished off with two epoxy color coats. For masking, Scotch Magic S U P ER POXV Mending tape does an amazing job. It ’•»'CHIB imisH S IS U « PAINT & leaves a sharp, fine edge every time. Its drawback is that it cannot be coaxed PRlMEfk around a corner or curve like masking CATALYST tape. Instead, one must score the tape along the desired line with the point of a for MODEL PLANES dead-sharp modeling knife. The tape and MODEL BOATS will tear sharply along this score. After the color coats, draw on ailerons, eleva­ Exclusively formulated for models. Super Poxy is a development of the tors, and other details using a drafting space age It is the easiest and most durable epoxy paint available. pen and India ink. The India ink will rub • MIX and USE · NO WAITING TIME · NO HAND RUBBING right off, so a coat of clear is sprayed on Look dt those features last. After the clear coat, finish off with • FAST CURING ■ QUICK DRYING · SET S UP RAPIDLY · MINIMUM DUST automobile polishing compound and a ADHERENCE * STAYS GLOSSY LONGER · LEAST AFFECTED BY ULTRA­ couple of coats of liquid car wax. VIOLET SUN RAYS or MANUFACTURED FUELS . .. everything you desire in a paint! ENGINES 11 BASIC COLORS · SPRAY or BRUSH Cox Black Widows are receptive to • Red * Blue · Yellow · Orange · White · Black · Aluminum · Metallic Green good break-in and hop-up techniques. • Metallic Blue · Metallic Red * our own K&B Purple · Alt available in $4 Pt The most important single feature of a or V2 Pt. cans Plus 22 ADDITIONAL COLORS available by mixing good engine is the right fit between the CATALYSTS CLEAR PRIMER THINNER piston and cylinder. The fit is checked Ά Pint or vj Pint PRIMER CATALYST For use with SUPER EPOXY with both piston and cylinder clean and ______. , . Yz Pint only______Pints or Quarts dry. A good fit is one where the piston OTHER K&B PRODUCTS TO COM PLETE 'The Matched Finish System” will just barely fall from its own weight " ™ K&B FIBERGLAS -fo r covering K&B SUPER POXY RESIN-for when released in the top dead center I« ' ·ι· ■ The highest quality, toughest weave- sealing and applying glass cloth position. We lapped in our engines with M fiberglass available, tor use with poly· Created to include all the characteristics auto polishing compound in the bore I ester or epoxy resin. Excellent contour- — desirable in a resin and its application. i ing q ualities make it easy to apply to H j Easily workable: Requires minimum while turning the engine with an electric H B L compound curves. sanding. Little, if any, clogging of sand­ drill motor. Don’t fail to thoroughly Available in 3 weights — 38 wide — paper Curing time adjustable by the LIGHT Tu OZ. CLOTH. For all wood a ir­ amount of catalyst. clean out all traces of compound before planes— cover 100%. Durable: Does not become brittle running the engine! We used the Cox MEDIUM 2 02. CLOTH. For increasing structural t QT. CAN (including catalyst) strength around fillets, nose, or interior ot plane. high-compression head because it will HEAVY 6 OZ. CLOTH. For Joining wings or molding increase power output without greatly your own parts. K&B MEASURING/MIXING CUPS increasing fuel consumption. Most of K&B Micro-Balloons FILLER - Twenty-four one ounce, unbreakable Mixed with K& B Resin is perfect for plastic cups. Epoxy resin and most the usual hop-up techniques, however, fillets or filling in defects for repair­ model and craft cements will not ad­ will increase fuel consumption more ing later damage). Sands beautifully here. Accurately graduated, from mil- to a smooth, strong hard finish. lileters to fluid ounces. than power. For example, to optimize 2.45 OZ. CONTAINER Cat. No. 8172. 24 to Package the exhaust and bypass timing on our particular Black Widows, we would have had to raise the cylinders above the K&B MANUFACTURING crankcase a few thousandths by shim­ DIVISION OF AURORA PRODUCTS CORP ming. Instead, we left it alone. Similarly, we did not port the cylinder for fuel 12152 WOODRUFF AVE„ DOWNEY, CA. 90241 consumption reasons. There are a num­ ber of things that can be done to the reed, but extreme care must be taken. that the pickup tube is on the outboard obviously needed, but we’ve seen a lot My own advice would be to go easy on side, just below horizontal. The purpose of fliers show up with weak or marginal reed changes. It is important to lay in a here, of course, is to use every last drop boosters. The starting procedure which supply of spares, even if you’re running of fuel from the stock tank. works best for us is as follows: After stock. We found that after numerous fueling the engine, prime a few drops FLYING against the closed exhaust port with the flights running wide open, the center The pit man in Mouse Racing is fully as portion of the reed would develop piston up. This avoids flooding. Start the important as the pilot to the team's engine. Kill the engine by pushing the fatigue cracks and fall right out of the success. Obviously, he must launch the middle of the reed. The ultimate reed heel of your hand against the root area aircraft as soon as possible and pit it in as of the prop disc. Watch out for the tips! change is to get your hands on an short a time as possible. Here are some obsolete reed from a Cox Space Bug. of the techniques which have won in our Top up the tank and indicate that you’re These are heavier and permit higher area. ready. Now, with the battery still con­ rpm before reed “ float” occurs. To get For starting, the Cox spring starter is nected, while waiting for the count­ the same effect, some troops use a well worth its weight. Not only does it down, grasp the prop firmly and pull it double reed, with one or two ears tack- give good, rapid starts, but more impor­ through compression. You should feel soldered together to keep them from tantly, it heads off the tendency of a an ignition “ bump". Repeat this every shifting position. An easy, risk-free reeo-valve engine to start and run five or ten seconds. If you lose the change is to reposition the backplate so backwards. Good, fresh batteries are bump, prime and restart the engine. The FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL ΈΜ MODEL BUILDER SENT YOU! 91 New From Astro Flight RSTRO PLIGHT HIC AUTO CHARGER WITH PIONEERS IN SILENT FLIGHT 13377 Beach Ave., Venice. CA EQUALIZER CIRCUIT • New fast charger for R/C electric cars has dual charge rate for 4 or 6 cell systems. • Equalizer circuit tops off battery pack between races for maximum performance. • Overnight use of equalizer recommended on new battery packs. • Equalizer helps eliminate possibility of reversed cells due to any weakening of a single cell within the pack. • Built-in pilot light gives positive indication of circuit function. Also available — our new stock class ROAR 05 racing motor with special high temperature insulation for maxi­ mum reliability. This new electronic motor Motor Control control provides on-off opera­ tion of the electric motors in The Hot Ones your plane, boat or car. The Our world famous Astro 15 unit, controlled directly from and 25 motors are now even your radio receiver, eliminates better. New, more powerful the need for an extra bulky, magnets and low resistance expensive servo. windings increase power 25% A voltage regulator powers over old systems. The new '79 the radio receiver from the models of these top-quality all motive battery, eliminating ball-bearing motors are dressed the weight of the receiver bat­ up with black anodized end tery. Electronic circuitry auto­ bells and prop adapter. matically turns the motor off when the battery gets low, assuring positive control.

object, of course, is to arrive at “ go” with box. answer to some authority and to the a ready engine and a wound starter that They are harder to fly. general public. If we can convince them requires only releasing the prop, pulling This point is dramatically opposed to that we are acting responsibly and are the booster, and releasing the model. one in our “ credit” column. The reason­ attempting to take proper precautions, The model should be moving one-half ing I have heard behind this statement fine. second after “ go!” . Pit stops involvea bit seems to center not so much on the fact However, one major point nags at the of teamwork between pilot and pit. On that they are “ harder” to fly, but rather back of my mind. Over the years at many most calm days, the pilot can whip the require adjustments. For instance, a displays and demos, I have encountered ship around to a pit area landing. revised consideration in the area of the uninformed general public and Landing? Actually, we don’t want a depth perception seems to be in order. heard the same statement over and over landing, but a deliberate high-speed They react slower, and while this may again. As they peer at a 60-inch span overshoot. The pit man does his second- easily be a “ credit” , one needs to adjust model, they state, “ I didn’t think they baseman routine and one-hands the to a more open pattern, and at some were that big.” model. Again, fuel it, prime it (don’t fields this may result in a trip over the Of course, these people harken back flood!), start, and release it. Keep your pits to get it around where you want it to a stick-and-tissue model from their eye on the pilot, but don’t wait for him until you get used to it. childhood, unprepared for the tremen­ to indicate “ ready” . It’s his job to stay It would appear to be a lesson in dous developments that have occurred. ready. If he has a problem, he can give a futility to attempt to debate the“ credits” You may talk with them for hours, "hold up” sign. and "debits” of big models from a safety This kind of event can be a real winter explaining the fantastic realiability of standpoint. In addition, we have not, equipment, etc., but how are you going shot in the arm for a club. Besides, a few nor ever will determine what is “ too weeks after the building contest, it’s to cope with the psychological effect big” . Man has always moved on a that certainly could develop when a Spring and everyone can go flying. This continuum that will make “ big” become super-large model drops into a crowd, a event is a good place to start if you want regular as he moves to bigger. In addi­ to add control line flying to your back yard, or someone’s car? tion, who has ever bought a “ small” box To speak to the lay public in terms of activity. · of cereal? They are always big, bigger,or kinetic energy, fly-ability, and the like, biggest (for the moment). (After "big­ will also be a lesson in futility. They 1 to 1 ...... Continued from page 15 gest" comes "family size", wen) simply see an object, possibly that they In addressing ourselves to the prob­ have considered a “ toy” , in a size that much-used equipment under the more lem, I think it is critical that we consider they had not even begun to consider. It strenous requirements imposed. Un­ the following point: is impossible for many to realize that fortunately, modelers will often do this. No matter how careful we are; no some models are now larger than some They’re harder to transport. matter how finely developed our ma­ full-scale aircraft. Not a safety problem, unless you can’t terials and methods become; no matter Many areas of the United States have see around it in your rear view mirror! If what is right, “ credit” or "debit” , there suffered bad press in years past. In many you insist on building super-big and will be safety concerns that develop. or most cases, it was totally unjustified. driving ultra-small, that’s your Pandora’s When they occur, we will need to Many of you will recall the case of an 92 WHEN CONTACTING ADVERTISERS, TELL ΈΜ MODEL BUILDER SENT YOU! MODEL BUILDER SAILPLANES LOVE ELECTRIC POWER

Yes, electric power and soaring are blissfully com­ patible; both are clean, quiet and lots of fun. Here is a perfect combination: • The high thrust Astro 05 electric power system. • The Super Monterey Sailplane, an improved version of the world-famous Monterey that features hands-off stability and an excellent floating glide. • The rapid charger that charges your electric system in just fifteen minutes from your auto battery. Now you can fly from that neighborhood field that is too small for a winch or high start. Fly electric! It's the neighborly thing to do. Available at your dealer now.

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Orange Couniy newspaper some years when a second look revealed that it was Those persons who have dedicated their back that utilized “ facts" in a distorted a “ very large model” (his words). It took modeling interests in this direction have view to develop a headline, “ Models. . . him some time to determine that he was infused many individuals with a new Perils to the Airways” . While the article in no danger from the model, as it was desire. They have promoted and carried was badly distorted, it used three basic safely below him; however, as he chat­ out “ non-contest” activities that have premises to develop its thesis: how high ted with me, he questioned the size. He produced a much-needed outlet. By far, we fly, how fast we fly, and how big the couldn’t believe it because it “ must have the vast majority of modelers have built models are. The information in that been seven or eight feet across” . He was, and flown in a responsible manner, article moved nationwide on CBS radio in fact, under the size since it was a probably more mindful of the risks than in Hale Sparks’ science feature. 9-ft. span. most builders. As I viewed the flight of the super­ Basically, what I feel we must do is Lastly, it creates a new world for the sized four-engine bomber in England address ourselves through our special scale builder, for it has opened up new during the recent World Champs, I was organizations and the national organiza­ horizons in model choice and materials. struck with the enormity (no pun in­ tion to the “ big” model. Weigh the It is not wise to exercise some caution tended) of the problem. As it lumbered relative “ credits” and “ debits” and and foresight in this area? Should we not overhead with its four huge engines establish some hard evidence to deter­ address ourselves to what “ too big” is, droning, it presented a very imposing mine their validity, now! both for competition and sport flying? sight. The crowd loved it. But there was a Establish some general guidelines to SPECIAL SPINNER SIZE AND SHAPE significant number of modelers standing work within and seek to develop the “ Here I am finished with my Widget 10 there among the lay public who were state of the art. Certainly, we must resist and now I find out nobody makes a relieved to see the 100 lbs. of model any fostering of “ make do” equipment spinner that shape. What a bummer!” land. They knew of the fragile link that sold simply to fill a market. Certainly every hobby store owner has existed between the ground and that We must strenuously discourage the heard the cry of anguish uttered by the model. They saw the vibration and ill-prepared model or modeler from frustrated scaler who tries to locate a movement of the control surfaces and flying at our sites. A badly-made model special size or shape spinner. The manu­ fixed parts when the engines were or flying junk pile is always dangerous, facturer in turn has probably taken shots running. no matter what size. Addressing our­ for not providing that “ one that’s Is a 20-ft. model that is 100 lbs. "too selves simply to contest rules will not needed". The problem, of course, is that big” ? What is “ too big” ? solve the problem. There must be a often the words “ one that’s needed” are Recently, here in St. Louis, I spoke consideration of classification for all correct. The manufacturer and dealer with a man, not a modeler, but in­ models. have to be concerned with some degree terested in modeling, who flies full-scale We will have to try and answer the of volume and can’t produce myriad aircraft. He was landing at a small airport “ too big” question, or most certainly sizes and shapes to fill one-time special that is near one of the R/C sites in St. someone else like the press, the general needs. Louis County. As he entered the land­ public, or the FAA will do it for us. The modeler has some recourse, ing pattern, he caught sight of a vintage Certainly, we in no way want to place in however, in solving his problem. There Aeronca “ entering the pattern from his jeopardy the fantastic interest that big is the possibility of having one machined left” . He almost broke off his approach models have pumped into modeling. or spun. This can be rather expensive FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 93 use. Depending on the weight of the cloth used and the thickness required, two to four layers are ample. Remember to stagger the joints. The finished spinner will slip off the HOLD IT! plug easily. The outside of the spinner may be finished in a variety of ways. Gentle sanding with the plug inserted to Anywhere act as a solid base can be done. In fact, you can do this in your drill or lathe. A layer of micro-balloons and resin is you want it. then added and sanded almost com­ ^PanaVise tilts, turns, pletely off to fill holes or uneven spots. There won’t be many of these, due to rotates. One quick turn the pressure exerted by the balloon. of the control knob The back plate can be one from a and you securely posi­ commercial spinner if the diameter is tion your work exactly correct, or you can turn one from aluminum or from material such as where you want it. phenolic, the material used for circuit You’ll wonder how boards. got along without it! Consideration must be given to at­ tachment, and this appears to be the Model 301 Original PanaVise shown. Model 381 with Vacuum sticky wicket for some applications. If Base. Plus a variety of other you are using a commercial plate, you'll interchangeable bases, holders find that many have a slot to center the and accessories for every spinner. It is possible to insert a ring hobby and craft use. Available inside the spinner to match the slot, and at your dealers. Write for FREE then build up the nose of the spinner, brochure and dealer list. drill a mounting hole, and use the long 8-32 screw and adapter nut. Since the B * y iS E eD.p,.CH3 spinner I needed most recently had 2850 29th ST„ LONG BEACH, CA 90806 screws around the perimeter of the back portion attached to the backplate, I utilized that method for the model as well. This does require drilling and tapping and causes a rather high degree of time required to yank the spinner to change a prop. The model on which this is used requires ten 0-80 Phillips head unless you have the equipment or use the balloon method of modeling, screws to be removed to get the spinner connections. Beyond this, however, one which has been around for ages. It is off. That can cause a lot of problems on a can produce one from common model­ possible to shorten the work time con­ flight line! Of course, it is not necessary ing materials, notably fiberglass. A siderably in using this method, however. to use that many if you are not working recent attempt at this proved to be most Instead of putting the typical super toward an exact scaled model. Leeway successful without a great deal of effort. finish on the plug, use Saran Wrap! has always been given in the spinner A plug is needed to accomplish the Mount the plug on a heavy dowel and area, as far as judges are concerned, task and that, of course, is most easily base or clamp the dowel in your vise. since they primarily look only for con­ roduced on a lathe. It can be made, Cover the plug with a layer of Saran sistent size and shape when comparing owever, by using a block of wood Wrap. Do not worry about the folds that the static and flying spinners, rather than chucked into your hand drill and turned are generated, since the thickness is so attachment. that way. Run a long bolt through the minimal that it doesn’t really matter. A word of caution concerning the block, with washers and nuts to hold it Prepare a somewhat oversize piece of holes. I found that such small holes as tight. One problem with the second fiberglass cloth to fit over the plug. The method is that you may not produce old teepee shape is fine. Mix the resin, 0-80, combined with a fairly thin fiber­ quite as accurate a plug, due to play in drape the cloth over the Saran Wraped glass spinner, resulted in quickly enlarged the drill bearings and the inability on plug and coat with a layer of resin. holes and the spinner parting company many to control the speed. A word of caution concerning the with the backplate. In fact, this hap­ While virtually any wood can be used next step. The balloons should be of pened on the Hiperbipe the very next to produce the plug, thought needs to fairly good quality. The dime store flight after returning from England and be given to the texture and grain, since a cheapies will give you fits, since they the World Champs. I believe this can be slightly out-of-round plug can be pro­ often are thin and break easily. Shop overcome by putting a thin strip of duced due to these factors. By using around and be certain you have a variety aluminum or brass between layers at the several pieces rather than a single block, of sizes. skirt of the spinner, or by building up you can control this more easily by Blow up the balloon and hold it by the this portion with additional cloth and matching grains. Make certain the glue valve over the plug. Push downward resin. sets, however, before you fling the over the plug, gradually releasing the air In addition, this type of spinner does pieces to the winds. as you go. Careful, not too much! not lend itself to hard electric starter use. The plug should be slightly oversized Experience and practice becomes a key I’m certain you’ve noticed what some in length and slightly undersized in here. It also makes it a lot easier if there people and starters have done to plastic diameter to accommodate the fiberglass are two sets of hands available, although and aluminum spinners, as they’ve worn buildup. How many layers of glass you’ll this is not required. a groove that would put the Grand want to use will depend on the size of Push the balloon completely over the Canyon to shame. the spinner (diameter) and the type of plug and it will automatically curve Some consideration should be given usage you intend to give it. Something under the plug to form a tight fit over the to balancing as well. If the spinner is between 1/32 and 1/16-inch thick is fiberglass cloth. Allow the resin to cure rather small (two inches or less), it will logical. and then remove the balloon. Repeat not actually weigh very much and may Once the plug is produced, you may this process for each layer of cloth you not be a problem. However, when they 94 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER get bigger and thicker, this can be a real concern. Detailing such a spinner can be a snap. FLY WITH THE WINNER! Some spinners, for instance, have a Pro Line radio control equip­ fluted edge around the prop openings. Using a piece of .010 Sig Aeroplastic and ment is the choice of champions. attaching it with Hobbypoxy PFC, you Think Pro Line: can easily reproduce this feature. When you want reliability ... Using the homemade fiberglass spin­ When you want performance ... ner can be an effective means of over­ When you want the very best... coming that perplexing problem so When you want to be a winner! often faced by a scale modeler. Now you We make every piece of Pro Line can get on with building your Widget 10. SHORT ORGANIZATIONAL SHOTS gear as if it would be During the first of December (which is used by a winner . . . and it a month away from this writing), the usually is! Cl AM meeting will take place in Paris. As the various subcommittees meet, the Scale committee will consider two Join Pro Line! specific proposals which have been Join the Winner’s Circle of submitted. Radio Control! Austria proposed that multi-engined R/C models be allowed to compete with a total swept piston volume of 20 cm3. This would, of course, allow the use of two .60cu. in. engines and would tend to encourage the use of multi-engined models. The United States proposed the inclu­ sion of R/C Sport Scale as an official international class in competition. This event has been held at the last several international competitions on an un­ official basis and has proved to be Pro Line Electronics Inc successful. 10632 North 21st Ave., Suite 11 Phoenix, Arizona 85029 In addition, the United States, through the efforts of many individuals such as (602) 944-4626 a subsidiary of Pace Industries Bill Hannan and Fernando Ramos, is attempting to discover the actual strength of free flight scale and to renew Jumbo rubber. The gas event will have modelers do not know how to success­ the interest of the CIAM in reinstating CO>, electric, and gas lumped together. fully install, prepare, and cover these the provisional rules which had been This should really be a pretty big affair! sheeted areas. Another negative aspect previously dropped. At this point, it is not known whether it of sheeting is the possibility of it sagging The National Association of Scale will be a one or two-day contest. Judging between bulkheads. This really looks Aeromodelers (NASA) has addressed will be loose and will be done after at bad. You even see this on full-size itself in a positive way toward the two least one official flight. Further rules will aircraft where the covering has been proposals and toward the promotion of be forthcoming next month. pulled or shrunk too much. I guess what I'm saying is that our free flight scale. First off, the sagging between bulk­ Larry D’Attilio, reporting on the bunch out here needs a change of pace, and hopefully, this will get many mod­ heads can be eliminated by making cer­ Milwaukee Flying Electrons' 1978 con­ tain that the part fits properly without test, relates the use of judges who carry elers into the action or out of the doldrums. We still plan on keeping the undue stress. The easiest way to prevent very good credentials: Gene Chase, EAA this from happening is to wet the outside museum director; Ben Owen, EAA PR Annual as it is, and still will continue to sponsor the R.O.W. (I believe that the surface of the sheet to be trimmed with Director: Don Coe, ex-Vietnam pilot; plain old Windex. There is enough Don Hoover,ex-TBF WW-II gunner, and Flightmasters is still the only scale organization to hold this type of contest. ammonia in the Windex that it aids in jim Newman. These men not only have a bending the balsa, regardless of the wide range of full-scale background, Those of you who have never experi­ enced seeing F/F scale models flying off thickness. There usually isn’t a problem but all fly R/C as well. when you are dealing with 1/32 or 1/16 Have you checked your area to see if water are really missing something!) They are also encouraging multi-engine sheet, but it is still a good idea to wet it there are individuals who have that kind down before you wrap it around a curve. of background to judge your contest?· flying. Plan ahead and get some model­ ing done so you can join in the fun this The next step is to secure the moistened balsa over the area to be sheeted. This is year! F/F Scale .... Continued from page 73 best done using masking tape. When the ♦ * * models will come the ones chosen to part has dried, trim it carefully until you compete at the international level. I have noticed that many rubber scale are satisfied with the fit. Do not force it Granted, this is not for everyone, but we modelers prefer not to sheet their down tightly when trimming, because still have the need. models in the areas where aluminum stresses can then be quite evident after In order to help boost enthusiasm, the panels should be represented. One gluing. Flightmasters club is going to hold, in reason. I suspect, is that this is done in Once the part is ready for gluing, it is May of this year, a Flying Aces type of order to hold down weight. However, it imperative that you trse a non-shrink contest. This will be in lieu of the regular could be that some feel that the addi­ type glue, such as Titebond or any of the Semi-Annual that the Flightmasters tional time and little added weight are aliphatic type glues. The use of these sponsors at that particular time of the not worth theeffort. It is my opinion that glues will prevent the sheeting from year. I would imagine that mass launch the sheeted model looks far superior to sagging from bulkhead to bulkhead. On events such as the WW-I, WW-II, and one with stringers all the way to the nose the other hand, Ambroid type glues Thompson will be heading the list, along block. Of course, this is a matter of taste. shrink when they dry, which in turn can with regular rubber and Peanut, plus On the other hand, it could be that some cause the unwanted sags. FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 95 ★ 4 44*44444444444444444444444444444 crutch type method of construction, 4 3>. the stringers seldom line up with the 4 notches anyway. Therefore, you can lay 4 each stringer on the surface of each 4 μ ρ 7 ^ 3 « = : bulkhead as straight as possible with 4 PROPELLORS minimum effort. 4 23 0 >Β S Μ)ΒΜΑΝ0>£ AVE TORRANCE. CA O0V5? PHONE 213-539-2313 Some of you might question the 4 OUR PROPELLORS ARE DESIGNED AND overall strength resulting from this 4 approach, but by the time you scallop ENGINEERED FOR MAXIMUM THRUST 4 between each stringer so that the 4 AND EFFICIENCY. bulkheads won’t show after covering, 4 there’s very little material on either side 4 NO REWORK NEEDED. TAKE THEM OUT of the stringer. At any rate, I find this to 4 OF THE PACKAGE AND PUT THEM RIGHT be a much easier method. 4 ON THE AIRPLANE If you disagree and still prefer to notch 4 for stringers, I would then recommend 4 that you do not pre-notch the 4 bulkheads. Instead, notch then during 4 assembly, as you are preparing to install 4 iu Ab ^ " the stringers. This way, you are assured 4 they will be straight! 4 Nose blocks on some models can be 4 somewhat of a chore. Usually, the 4 -O carving job goes along at a pretty good 4 LARGE SIZE PROPS clip, and is one that I personally enjoy. 4 (I’m talking about nose blocks that are 4 UP TO 24" DIAMETER fairly long, like you would find on a 4 IT Thompson racer or that were typical on 4 6", 8", & 10" PITCH ? the old Berkeley rubber scale models.) 4 * But then, if you have to hollow the block 4 out. it takes a great deal of time and 4 V AVAILABLE IN THE FOLLOWING SIZES: ( Í patience to do it right. Of course, 4 DIA PITCH DIA PITCH L I vacuum forming can be employed, and ή certainly this is a very acceptable alter­ 4 v 11" S-6-7-7.5-8 8.5" 4-5-Ó-7 '" 'f 4 % native. 11" 6W-7W 8" 4-5-Ó-7 There is yet another method which 4 10" 4-5-Ó-7 7.5" 4·5·6·7 4 may be useful to many of you, and one 9" 4.5-Ó-7 7" 4-5-67 that can be added to your varied model­ 4 4 44444444444444444444444444444444 ing techniques. Have you ever con­ sidered carving a cowl out of foam, then When you have completed all of the Doping then follows. Normally, I use sheeting it with balsa? You start out by sheeting and you are now preparing thinned-out white glue for all my cover­ using the cheapest foam you can get the model for covering, one additional ing, but I have found, if I use white glue ahold of and carving and sanding it to step that I include is to coat the under­ for the sheeted area, that when it dries, it the shape required. The final contour side of the sheeting with a coat of leaves a very shiny residue. This distracts should be 1/32 inch undersize all the Hobbypoxy clear. Before you think that from the appearance of the model. If way around. Then start covering this I’ve lost whatever I might have had, hear you plan to use paint on the sheeted foam with sheet balsa in the largest me out. I heat the Hobbypoxy, using a areas, then it is no problem. So, for these sheets possible. You may have to splice light source or hot water, until the parts I use dope. in odd shapes in order to get the entire viscosity of the epoxy is like water. By With their increased popularity, rub­ foam cowl covered. All sheeting should coating the underside of the sheeting ber scale models are becoming more be done with an epoxy glue. Be careful only, there is no hard sanding to accom­ and more available in the hobby shops. and do not let any of the glue ooze out plish. What I have found is that once the Many of these scale kits are built via the between the joints. If it does, use material has dried, the balsa is “ locked crutch system, as used primarily by acetone or MEK on a rag and wipe it off in” , and from that point on, it will not Guillow and Sterling. If any sheeting is immediately. If you aren’t careful and shrink one little bit. I have models that done on models built in this manner, it there is a surplus of glue on the surface, are several years old, and the sheeting is has to be done in between the stringers. you will find it most difficult, if not still true. The key is to use hot Hobby­ This can be a real time-consuming pain, impossible, to sand it off without ruin­ poxy, because it thins out so much that since each has to be fitted individually. ing the soft balsa on either side of it. you get good penetration and virtually There is a very simple solution that you The sheeting must be applied with an no weight gain. may want to consider the next time you epoxy. Preparing the sheeting for covering build using this type of construction. Once the sheeting has dried, sand can be done in several ways after the Take each bulkhead where sheeting will evenly until it is smooth and uniform. epoxy treatment. A lot of modelers new be required, and cut it undersize by the From here, you have two approaches. to scale modeling may not be aware of a thickness of the sheeting. Now you can One is to apply several coats of dope, rather simple procedure for doing this. wrap the sheeting around the bulkheads sanding lightly between each coat until One approach is to coat the sheeting with little or no difficulty. It may take the surface is very smooth. Or, you can with several coats of clear dope, sanding several pieces to go all around the apply a couple of coats of heated between each coat. This is pretty stan­ fuselage, but it will be much simpler. In dard. The next step would be to place fact, as far as I’m concerned, with the Hobbypoxy, as I mentioned earlier. the tissue over the sheeting and attach it exception of the notches for the top, Sand this with about 320 or 400 grit (wet) by using thinner . .. working out any bottom, and sides keels, I would rather until smooth. Usually, two coats will give wrinkles that may have gathered. Well, a have each bulkhead undersize by the you a very satisfactory finish. I prefer the better way. I feel, is to secure the tissue size of the stringers being used. In other latter system because you are trying to only around the edges, similar to the words, if you are using 1/16 square simulate metal, and if the cowling is way a wing would be done, let dry, then stringers, the bulkhead would be cut silver, in particular, the results will be water shrink. The tissue will fit snugly down that amount all the way around. more realistic. Weight up front is usually over the sheeting with not a wrinkle. Since most kits I have built use the desirable anyway, and I would rather 96 WHEN CONTACTING ADVERTISERS, TELL ΈΜ MODEL BUILDER SENT YOU! MODEL BUILDER have detail than a piece of clay hanging from the bottom of the nose of a model. At this stage, a couple of steps for additional detailing may be done, such ATTENTION! as grooving in panel lines with a very sharp triangular file or equivalent, and adding small drops of glue to represent rivet heads. At this point, you will be ready to remove the foam core from the Control Line Flyers! sheeting. This can be done by immersing the whole cowl into a container of acetone, MEK, or even gasoline. (The Fox Cares About You! latter I would use only in a pinch. Gas is really bad news from its potential dan­ ger!) Use gloves and have plenty of In the scramble for the R.C. dollar ventilation, or better yet, do it outside! many manufacturers have by­ These solvents will readily eat away at passed the control line flyers the foam core, leaving you with a needs. Not so at Fox. In the last beautiful but light cowl. You may prefer couple years we have upgraded to use 1/16 sheeting instead of 1/32 . . . that’s up to you. Another item to our control line motors and added keep in mind is to check a sample of many new control line products. foam to make certain that one of the We invite your inspection of our solvents mentioned will eat away the tanks, control lines, bell cranks, foam. Otherwise, you would have to hollow it out just as if it were a balsa control handles, fuel bulbs, fuel block, and you would have gained line, wheels, wheel collars, and little. · Fox Combat Special other products. Our catalog is 1978 Nationals Wins free for the asking. Gross Vogel . . .Continued from page 19 Slow Combat Open For the beginner we have as­ equivalent) spar material is not available, 1- Dick Stubblefield - Fox sembled starter sets consisting of 1/4 X 3/4 spruce spars may be substituted. 2- Larry Driscoll - Fox a motor, mounting bolts, fuel line, The spars may be laminated from 1/4 x 3- Geo. Cleveland - Fox tank, bell crank, elevator horn, 3/8 Sig spruce, since the bending load Fast Combat Jr. wheels, wheel collar, fuel filter, along the center of the spar will be near 1- Tom Fluker - Fox zero. extra plus, control lines, handle, 2- Mathis - Fox and cups! All matched and at a WING 3- White - Fox The wings are constructed in four Fast Combat Sr. considerable price savings over sections, using lightweight balsa 2- Bill Maywald - Fox buying them separately. We throughout. Construct the wing sections 3- Russell Crawford - Fox suggest you consider with the lower spars flat on the building board to assure proper alignment. Bevel Fast Combat Open #81015 Fox 15 Baffle Starter the lower trailing edge sheet and glue in 1 -Phil Granderson - Fox Set For Profile Models — place, using trailing edge shims cut from 2- Mike Tallman - Fox $37.95 or #81016 Fox 15 scrap balsa. Use a dihedral jig to incline 3- Bob Mears - Fox 4- Kams - Fox Schneurle Starter Set For Pro­ the ribs at the dihedral joint to the file Models — $43.95 proper angle. Add the main spar web­ Congratulations! And Thanks. bing and upper surface sheeting prior to While most of our motors are removing the wing panel from the pleasure oriented we thought you building board. might like to see how one of our When constructing the wing center competition oriented motors sections, build with the spar boxes and wing alignment tube in place. Check the fared at this summer's Nationals. root rib with a square to assure a good fit FOX MANUFACTURING CO. with the fuselage. Add hinge blocks 5305 TOWSON AVE TORT SMITH. ARK 7M0I SEND FOR OUR FREE CATALOG. prior to gluing the upper trailing edge PHONE 50ι-545·ιβ56 sheeting in place. Remember, the spar webs are mandatory! Proper alignment of the wings will be remembered to leave a bit of the rear If the two halves of the wing are not assured if both wing center panels are spar exposed when you added the aligned properly, a built-in turn will built at the same time with the center forward sheeting, it will provide a good result which would be extremely diffi­ spars and alignment rod in place. base for the capstrips. Make the cutout cult to overcome by normal trim proce­ Cut slots in the dihedral joint ribs to for the elevator in the center wing dures. If the wing center sections were accept the plywood dihedral braces, and panels and add the trailing edge spar. built with the spar boxes and aluminum sand the ends of the wing sections with a Sand the wings to shape and add the spars in place, the following procedure long, flat sandblock. I use a sheet of plywood root ribs. will assure proper wing alignment. sandpaper glued to a 1x3x15-inch block Cut the elevators from light sheet Cut the center spar boxes to length, of fir with rubber cement. Butt glue the balsa. Add the plywood insert for the and while holding in position inside the wing sections together with the dihedral control torsion link assembly and sand fuselage, slide the wing joining spars braces in place. Add the remaining spar the elevator bottom to match the airfoil through the fuselage sides and spar and trailing edge webbing from soft reflex shape. Form the components of boxes. Do not glue in place at this time! vertical grain balsa. the elevator torsion link from brass Slide the wing alignment rod through After the wing dihedral joints have stock. Sweat solder the square tube to the holes in the fuselage sides. The rod dried, remove the unit from the board the brass sheet and drill holes for the should extend about one-half inch on and install the lower sheeting. Glue the mounting screws or bolts. either side of the fuselage. capstrips and wing tips in place. If you FINAL ASSEMBLY Place the fuselage on a flat surface and FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 97 EIGHT "ELECTRIFYING" EVENTS!!

1. JR. FR EE FLIGHT: Any plane and motor, unlimited motor run, 3-minute max, for contestants under 16 years of age only. 2. FR EE FLIGH T SCA LE: Mooney system for scale judging and flight scoring. 3. OLD TIMER REPLICA FREE FLIGHT: For Astro 02 motor only, any old timer, 25 second motor run, 3-minute max, hand launch. 4. UNLIMITED F R E E FLIGH T: Any motor, any plane, 25 second motor run, 3-minute max. 5. R/C POWERED SAILPLAN E: A 2-minute motor run and 6 minute max, with spot landing bonus points. 6. SPORT PATTERN: Novice Pattern with special handicap bonus points for planes with less than 4 channels. Anyone can win this event! 7. SPORT SCALE: Stand-off scale, Mooney judging system, extra bonus points for multi-engine aircraft. 8. ELECTRIC OLDTIMERS: A 2-minute motor run and 5 minute max, with spot CHAMPIONSHIPS landing bonus points. Free Flight CD: Bill Stroman. (213) 868-1479. R/C CD: Bob Boucher, (213) 472-6344. Name AMA MODEL BUILDER MAGAZINE AND ASTRO FLIGHT Jr. F/F ( I R/C Sailplane! ) COMBINE TO BRING YOU THE FIRST ALL-ELECTRIC F/F Scale ( ) R/C Pattern ( ) CHAMPIONSHIPS. TROPHIES TO THIRD PLACE AND F/F O.T. ( ) R/C Scale ( ) F/F Unlim. ( ) R/C O.T. ( ) FOR GRAND CHAMPION. PRIZES FOR ALL. COME JOIN Each event: $1.00 All events: $4.00 US IN THE QUIET REVOLUTION AT MILE SQUARE, All events for whole family: $5.00 FOUNTAIN V A L L E Y , CALIFO RN IA, ON JAN. 14, 1979 Send check and registration to Bob Boucher, 2301 Cheryl Place, Los Angeles, CA 90049 Preregistration requested. add sufficient weight to hold it in place. inch printed circuit board. The rudder simulate feathers when viewed from Slide the wings in place on the aluminum control horn is made from a piece of below. The bird emblem and lettering spars and the alignment rod. Measure brass tubing. were cut from trim Monokote and the distances from the bottom of the The tail wheel and rudder tiller as­ floated into place on a film of soapy wing under the forward sparand trailing sembly is best made from soft wire, such water. edge to the table. Measurements must as that used in wire coat hangers. Bend CONCLUSION be the same for both wings. Adjustments to shape, leaving the top straight, and I hope your GROSS VOGEL will bring may be made by enlarging the fuselage solder the control horn in place. you many happy flights! Despite old openings slightly and shimming the Slide the tiller assembly through the pilot tales to the contrary, a flying wing wing to the proper height. fuselage from the bottom to the exit just with a properly located center of gravity When satisfied with the wing position, behind the fin. Make a ninety-degree is impossible to tumble. spot glue the center spar boxes and the bend for the tiller where it will enter the Remember, while GV is quite easy to alignment rod in place using 5-minute plywood rudder insert. It is not neces­ fly on medium to low power, it can be a epoxy, taking care not to glue the sary to fasten the tiller to the rudder bit of a handful on takeoff or with full aluminum spars in the process. permanently. power. If you are not an experienced After the 5-minute epoxy sets up, Mount the radio equipment as far flier, seek help for those first flights. remove the wings and slide the forward as possible. In the prototype, a Have your helper read the flight tips so aluminum spars out of the fuselage. The Kraft three-channel was installed with he will know what to expect. center spar boxes should then be per­ the throttle servo mounted in a plywood Please feel free to call or write if you manently glued, using a slow-curing tray beside the brick. The antenna was have further questions. If the 1/8 x 1/2 glue. routed externally along the side of the aluminum Handi Metal is not available CONTROL LINKAGE fuselage. in your area, I can supply it for $3.00 per Except for the torsion link, the eleva­ The landing gear is fastened to the set postpaid. Chas. Clemans, 14730 SE tor linkage is similar to that normally bottom of the fuselage using two 3/16- 45th Court, Bellevue, WA 98006. Phone used for strip ailerons. Nyrods are not inch nylon bolts with the nuts epoxied 206-747-5032 (after 8 p.. PST). recommended for this application be­ inside the fuselage. A drilled and tapped REFERENCES AND ADDITIONAL DATA cause of the large size of the control wooden block may be substituted for "Six Flying Wing Sections” , Western surfaces. The pushrod set-up shown on the nuts. Plan Service, 5621 Michelle Drive, Tor­ the plans is quite rigid and provides the FINISH rance, California 90503. necessary spring action to keep the Hobbypoxy finishing resin andenamel “ Experiments In Flying Wing Sail­ torsion links in place. were used to finish the fuselage, rudder, planes” , Jim Marske, 130 Crestwood The torsion links will look a bit odd and fin on the original. The top and sides Drive, Michigan City, Indiana 46360. with the wing off as they just sort of flop of the fuselage are silver, with the “ Little Plank” , construction article, C. about. However, once the wing is in bottom black. Clemans and D. Jones, RCM, May, 1972. place, they become quite rigid. Check The wings were covered with Super “ Standard Plank” , construction arti­ all solder joints prior to final assembly. Monokote. The upper center panels are cle, C. Clemans and D. Jones, RCM, July, The rudder bellcrank may be made silver, outlined with white. The bottom 1975. from 3/32 plywood, aluminum, or 1/16- of the wings are black with white tips to “ In Search of a Competitive Flying 98 WHEN CONTACTING ADVERTISERS, TELL ΈΜ MODEL BUILDER SENT YOU! MODEL BUILDER FOR INCREDIBLY DEVCON® DEVCON® “ 5 MINUTE EPOXY® 5 MINUTE AND STRONG JOINTS For super 30 MINUTE fast repairs EPOXY IN BIG Tried and 4 Vi OZ. NON- STICK proven by BREAKABLE modelers 8QUEEZE everywhere. BOTTLES. WITH US! DEVCON is The ideal the ideal modelers DEVCON® t m model cement “DEV-TUBE” builders bonds all ■'5-Minute" Epoxy in the cement. metals, wood, Revolutionary new 2 in 1 Great fiberglas and dispenser. strength, most plastics. Just snip off end ot fast setting Clear and double nozzle and push fuel proof. out equal parts ot epoxy and is and hardener - automa­ fuel proof. 9 oz. tically. Ju st mix and combined wt. apply. When finished, 2 Sizes. close nozzles for R-205 . . . $1.59 M-209 5 Minute $6.25 —' future use with M-33 30 Minute $6.25 special cap. R-206 . $2.89 SUPER MODEL CEMENT The kind of good old-fashioned model airplane cement that modelers have been using for the last 25 years. Excellent for building and repairing wood models - strong, fast drying, clear and fuel proof. Cat. No. 201. 1-3/i oz. tube $.75 DU-BRO PRODUCTS INCORPORATED1 480 Bonner Road Wauconda, Illinois 60084 U.S.A.

Wing” , a paper by D. Jones. January. was unable to quite clear a lamp-post, ace model maker of musical instruments, 1977. · and when he did reach earth he found we had occasion to read a book entitled himself in the clutches of a policeman, "Antonio Stradivari, His Life & Work who wanted to arrest him for damaging (1644-1737)” . Written by the Hill Brothers Hannan...... Continued from page 82 the lamp-post. The committee, however, and originally published during 1902, set matters right; 'Those German polizei the item has been reprinted by Dover filled with facts, photos, and 3-view are real humorists.’ ’’ End of quote. Publications, Inc., of New York. drawings. About the only detracting Violins and model aeroplanes have a factor was the price tag, some $45! NATS PEANUT REPERCUSSIONS CONTINUE number of features in common: Each Recently, we received a catalog from involves (hopefully!) fine craftsmanship, Publishers Central Bureau, which is now Max du Blue, writing in the Cleveland Free Flight Society “Crosswinds” , sez: exacting selection of materials, and the offering the book at the bargain price of investment of much patience and time. $17.95, plus $1.95 postage. By all means, "Say Charley, can we get BAN THE TEE DEE PEANUTS buttons, too? (apparently Also, either item is fragile, and subject to if your interest includes racing planes, easy damage. Stradivari instruments consider this rare opportunity. Publish­ someone had some relating to Laceys, etc.). A mob is gathering to help cover have stood the test of time as among the ers Central Bureau, 1, Champion Ave., best ever produced, and other makers Avenel, NJ 07131. Gas Peanuts with feathers, using black contact adhesive (tar). Some may spill on are constantly searching for the "secret STAND-ON SCALE? formula” that set these masterpieces in A rather disturbing trend seems to be the builder." “ DARING” GOEHRING UPDATE such a lofty position. The Hill brothers emerging, judging from the looks of the examine the individual factors, one by radically shortened landing gear legs The man-powered flying machine shown in our December column has one, and reach some fascinating conclu­ seen on some R/C Sport Scale models. sions. One, the material involved is NOT Rather the opposite of the rubber- now been successfully tow-tested, more than twenty times, at the Palomar Air­ of major importance. Good wood was, powered “ scale” models with their of course, selected, however. . . "mate­ gears stretched! Come on, fellas, the port. Tests conducted at about six feet of altitude included tow-release and glides. rial taken from old buildings, such as ground handling can’t be all that bad, "Swiss Chalets” is a delusion. Our can it? We’re reminded of Mercedes Further tests, to be conducted in the desert, will employ longer towlines, and opinion is rather in favor of the more 230SL coupes, which have a quiet dignity youthful wood.” Incidentally, the master about their design, until viewed from possibly, a small auxiliary engine, while Goehring becomes thoroughly familiar used both slab-cut and quarter-cut the front or rear. From those aspects, it wood, just as model builders do! appears that an elephant has strolled with the control system. So far, the craft across the rooftop! has exhibited exceptional stability, Continuing on the subject of mate­ AERIAL DRAGNET which came as no surprise to its long­ rials, the authors opine: "Our conclu­ From Dave Stott comes this quote time free flight model builder designer. sions are, then, that Stradivari’s choice of from the October 9, 1909 FLIGHT” Also, it recently received a trophy for the materials depended upon the circum­ magazine: "During the Flying Week at best workmanship entry, during a two- stances: 1st, the remuneration he was to Berlin, Germany, the following incident day Fly-In at Ramona Airport. receive for a given instrument; 2nd, the took place: "Latham (the famous Antoi­ PRODUCTIVITY choice of wood he had at the time in nette pilot), in trying to land in the dark, Through the courtesy of Fred Williams, stock. Some years offered an abundant FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 99 controlled model club: Ί know a man visiting from back East who has a scale model flying saucer he’d like to fly at the The new 4th edition R/C field. Would that be all right?’ asked one of the members. ‘Sure,’ came a re­ ply, 'but I doubt that it's a scale model flying saucer!’ After a slight hesitation, Your Guide to the the member replied: 'You may be right, but who are you to say it's not to scale?’ A smiling nod answered, ‘Guess you R/C w orld Only S5.25 have a point there.’ ’’ MAGNIFICENT MARKINGS Many scale model builders select their subjects, at least in part, on account of their color schemes. Most rules offer 2,000+ R/C Items rewards for well-executed markings, but Pictured. Des­ some builders actually shy away from cribed, and Priced them, preferring plain-jane machines which are easier to execute. Artistic types usually feel just the opposite, and often pick subjects which require unusual talent to recreate. How about this one for a real challenge: Featuring R/C According to the September 14th issue Systems, Aircraft, of AERO AND HYDRO for 1912, describ­ Boats, Cars, ing the Gordon Bennett Cup winning Engines, Tools, Deperdussin, "On the left side of the & Accessories. fuselage of Vedrines’ race machine there was a reproduction of the famous painting known as the Mona Lisa, or 'La Jaconde.’ ” THACKER STRIKES AGAIN More than 200 Q : Tell me. Colonel, how can you be Manufacturers such an outstanding model builder, Included flier, and all-around good fellow and yet be so modest? A: "It’s all done with mirrors!” ·

Flying Wing .. Continued from page 55 Indexed and squares, .40 engine) designs: the R/C Cross-Indexed for gliders were mostly Ravens, semi- Information about more than 2200 model aircraft, cars, Ravens, or Raven-ites. True, both of boats, engines, radio systems & accessories. Easy Use. these are excellent designs, and a sure­ fire way for those of us who are not Please send m e ______copies of the new fourth edition of the designers to get into the action. But you Radio Control Buyers Guide. Enclosed is $6.00 for each copy know, we all get tired of vanilla all the AT BETTER ordered ($5.25 for each Guide plus $.75 for postage & handling). time, and after a while, get to wondering HOBBY what maybe tutti-frutti tastes like! But the look-alikes ended with the SHOPS OR Total Enclosed. .. (U.S. and Canada only) airplanes; the flying abilities and tech­ ORDER N a m e : niques were the determining factors in DIRECT! the final rounds. The results were as Street Address:. follows: R/C POWER MM C it y , S ta te , Z I P : ______1st) Tony Nacarato Return to: Boynton & Assoc., Clifton House, Clifton, VA 22024 2nd) Wayne Sakamoto 3rd) Chris Comley R/C SAILPLANE selection, others only an indifferent model, nor top-quality paint assure the 1st) Rick Norwood one.” results of a model’s finish, unless the 2nd) Don Simon Then there is the question of the materials are correctly employed. 3rd) Pat Seale F/F RUBBER AND JETEX finish, another similarity to models: What about that other priceless ingre­ Supposedly, Stradivari had a sort of 1st) Wade Wiley dient: time? Well, this may come as a ” magic" varnish, some thought respon­ 2nd) Bob Boehme* * surprise, but Stradivari could really 3rd) R.A. Short* sible for at least in part measure for the crank ’em out, producing over 1,000 4th) Hilde Boehme fine tone of his products. About that, the instruments during his active years, Hill brothers have this thought: "Fine *Tied for 2nd. apparently about two violins per month. F/F GAS AND ELECTRIC varnish was in the hands of fiddle- Even more astonishing was the fact that makers before Stradivari was born. The 1st) Wade Wiley he continued to create these master­ 2nd) Jim McDermoth materials he used exist now, as in his pieces until the age of 94 years! day; but it will prove one problem to F/F TOWLINE Wonder how many model builders 1st) Ken Sýkora make the varnish, and quite another to are still at it, past ninety? utilize it with the perfect success of 2nd) Tony Nacarato Stradivari.” MORK AND R/C? 3rd) Addie Nacarato There we find the real key, the talent From “ The Prowler” , Times-Advo- I’d like to point out some interesting of the builder! Just as choice balsa will cate, Escondido, California: “ Overheard facts. Addie Nacarato, 3rd Place F/F not guarantee success of a microfilm at a meeting of the Palomar Flyers radio- Towline winner, is the "A ” of T & A

100 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER Hobby Lobby, one of the better-known hobby shops in the Los Angeles area. She is also the mother of Tony Nacarato, winner of 1st in R/C Power and 2nd in F/F Towline. Third Place R/C Power winner, Chris Comley, is only 16 years old. He flew his SHIRTS Evans “ 540” to this position amongst DISPLAY THE EMBLEM THAT TELLS EVERYONE some pretty stiff older and more experi­ YOU'RE A SUPPORTER OF enced competition. He also flies a Phoenix pattern ship, retracts and all, and appears to have a lot of future otential. If this young man doesn’t get imself side-tracked somewhere along the way. we should be seeing his face and name in winner’s circles from now on. And last, but certainly not least, is little 9-year-old Hildie Boehme, from down San Diego way, who is into her second year of modeling and who placed 4th in the F/F Rubber and Jetex event. Not bad for one who is handicapped by having to launch about three feet LOWER than anyone else, and who has her father for a pit crew! Good luck to all these youngsters, including Addie! ·

Soaring...... Continued from page 47 common to lean back prior to launch. In doing so, the wings may no longer be (COMING OR GOING . . . THE EMBLEM IS ON FRONT AND BACK!!) level. Typically, a right-hander then throws the plane into a right turn. This requires immediate correction . . . and ÍC 9 5 there’s the danger of overcontrol due to the high speed of the launch. I’ve also EACH, INCLUDING THIRD CLASS POSTAGE. ADD 50 H e l í - B t > y < RC-HELICOPTER

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305 422-1531 305 647-1335 312 697-3737 805 498-3537 by mail (c/o Webster’s Hobby Shop, 30 much better than the paper clip hold­ products, too. (Well, there it is for you East Camelback, Phoenix, AZ), or drop downs shown on the plans. We’ll try to guys who’ve been reading about West by the shop on Friday evening before incorporate this mod on future kits. Coast fliers using Fuller Plast for fuel­ the contest. Dave Thornburg assures me 2) -Bruce Kimball uses a sheet of plate proofing and wondering where to get that Mildred's Cafe is still open in glass on top of his workbench for a some. The properties of Imron sound Buckeye and that this year there will be building board. Says it holds the plans quite similar to Fuller Plast, which I’ve no downwind launching. down perfectly flat, you can see through used for years. Only on flying surfaces, This contest always brings a pack of the glass, and the glass is totally un­ though. On fuselages, I’ve had bad fliers down out of the Colorado and warped. But how do you stick pins in the experiences, so I’d stick with epoxy New Mexico mountains to thaw out in glass? You don’t . . . pieces are held in there, where raw fuel is likely to be mid-winter. There’s bound to be a good place on glass with plastic typewriter key present in huge amounts, the way I representation from Southern California cleaner (Silly Putty might work, too). work.) as well. Looks like a good time coming When finished building, scrape the type MYSTERY MODEL OF THE MONTH up for one and all. · cleaner off the glass with a razor blade. This month’s mystery model appears Bruce also finds that a Pink Pearl pencil to be a cross between an Old Timer and F/F ...... Continued from page 81 eraser makes a good miniature sanding a Civy Boy. Only hints I’ll give are that it block for indoor HLG’s. Wrap the sand­ was designed by a currently active West Model Products, 880 Carmen Court, paper around the eraser; it contours to Coast flier and published in an American Laverne, CA 91750. the surface being sanded, especially the magazine after WW-II. If you think you (Other cottage industry manufac­ undercamber. know what it is, drop a letter to the MB turers: please send photos and catalog 3) The FFIyer newsletter, out of Ala­ office. If you’re first, you get the free information about your products and I’ll bama, edited by Bill Matthews, touts subscription. try to give you a plug, too.) Dupont 700S clear Imron polyurethane NOMINATIONS FOR TOP TEN HINTS ’N TIPS as a top coat on power models. After MODELS AND FF HALL OF FAME 1) Also at Taft, I ran into Bob de- applying 2 coats of 50/50 nitrate dope, NOW OPEN Shields, who proudly showed off one of spray on one good wet coat of Imron. Tony Italiano sends word that he is our RM Maverick kits he’d built. (Said it This can be done as soon as the last coat chairman of the NFFS Top Ten Award came out at 5'/2 oz. finished weight, too!) of nitrate is dry to touch. The Imron Committee again this year, and that What really struck my eye was how he’d must be sprayed, but there is no waiting nominations are in order for 1979. handled the wing hold-downs on the for days for the dope to cure, as is needed Categories are the 3 FAI classes. Out­ built-up pylon. He used 2 pieces of 1/64 with epoxy, etc. Without an accelerator, door Rubber, Indoor Rubber, Small ply, about 1/4 inch wide and 1-1/2 the Imron will cure in 4 to 6 hours. An AMA Gas, Large AMA Gas, Indoor/ inches long, at the front and back of the accelerator will shorten that to 2 hours. Outdoor HL Glider, and Special awards. pylon. These were glued to each side of For complete protection from really hot Tony is also soliciting nominations for the pylon with Hot Stuff, then brought fuel, it must cure for 5 days. Imron can the 1979 additions to the Free Flight Hall together ahead of the pylon and glued. be bought from any automotive paint of Fame, in order to give recognition to Result is a neat, light, strong way of store selling Dupont paint, in quarts or those individuals who have contributed holding the wing rubber bands in place, gallons. Cheaper than usual hobbyshop to the development/f urtherance of Free

102 WHEN CONTACTING ADVERTISERS, TELL ΈΜ MODEL BUILDER SENT YOU! MODEL BUILDER IDHB-ENGINI Made in W.Germany PERFORMANCE· PRECISION · POWER DESIGNED AND MANUFACTURED TO MEET THE HIGH PERFORMANCE DEMANDS OF TOMORROW’S COMPETITION-TODAY! HB.21 PDP* (3.5 ccm) The HB-CAR ENGINE is an engine with ‘ Perry Direction.il Porting one purpose in mind.. .TO WIN AUTO RACES! This is not an aircraft engine that was modified for cars, but a car engine intended only for cars.

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Flight. The following considerations The first model of Plane Jane that I power you need to drive it at its most apply to Hall of Fame nominations: built had wings covered with balsa. The efficient speed, the speed envelope you a) Scientific developments directly production version now coming off the intend to fly it in, and the type of attributable to model airplane develop­ assembly line has wings covered with performance you’re looking for. Re­ ments. 1/64th plywood. This makes for a member that the closer you are to the b) Designs that have formed a trend smoother, more durable wing, less above suggested limits, the more at­ copied by many. susceptible to dings. tention you will have to pay to propeller c) Sportsmanship/rapport on the Soon to come off the assembly line is a matches, wing and tail incidence, bal­ field. Twin Jane, powered by two .10 engines. ance. control surface gap, etc., in short, d) Individuals who have, through We will do a product review on it in the anything that produces unnecessary their efforts, coagulated designs and near future. drag. When designing or building any concepts, edited down to the written Whether you want a trainer or sport aircraft, try to avoid anything that will word, understood by the average model for tooling around, you will not hinder flight. Forgot something, haven't modeler. be sorry to build a Plane Jane. · I? First you have to get moving on the e) Nominees must be known to more ground or water, not only at sufficient than a handful of modelers. Send nomi­ Mammoth .... Continued from page 25 speed but also at a minimum drag nations for both the Top Ten and Hall of configuration to reach that speed, Fame (by Jan. 31) to: Tony Italiano, 1655 bearing (no pun intended), as does preferably balanced on either floats or Revere Drive, Brookfield, Wl 53005. · lift/drag configuration, etc., but if you wheels so that a minimum of rotation work on the theory that each individual effort is required to lift off. A lot of Plane Jane .... Continued from page 69 combination, i.e. powertoweight (pow­ aircraft have never fulfilled the meaning of the word because they were lousy ready for more power. This is where the er loading), area to weight (wing load­ ing) should have to look right by itself boats or vehicles. Far too many people .25 comes in. Plane Jane can do the job are discovering that while they have an of handling the extra power with no bad first, you’ll find aircraft design a lot simpler. In powered aircraft these are acceptable airplane in the air, it’s a real handling characteristics. Super Tigre dog to get there, while others get the and O.S. engines are distributed by the two main concerns. Try treating them separately at first and notice that same weight off in a few feet and still World Engines and have been around perform the same in the air. awhile. They are more dependable and the common denominator is weight. durable than most engines. Choosing Now for the compromises, lift-to-drag Let’s start with wheels first, realizing in these engines for power in Plane Jane ratios, the type of propeller best suited both cases that if you’re dead scale to a was a wise choice. to the aircraft you intend to build, the real aircraft, you’re limited to what you Be ready for the Spring flying season. Get your KRAFT R/C system checked-out early! S a v e Kraft R/C systems received at the factory thru April 15, 1979, will receive 1 0 % oft T i m e on all repairs when accompanied with this ad. This offer does not apply to new system components or accessories. n ?

MB Kraft Systems, Inc. · 450 W. California Ave. · Vista, CA 92083 · (714) 724-7146.

FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL ‘EM MODEL BUILDER SENT YOU! 103 February 24 & 25 Westchester County Center, White Plains, Don’t miss our 11th annual super show... it’s the biggest and best yet! Keep that last weekend in February open.. .the 1979 AND, make sure your latest creation is finished up WRAM's Show is going to be the largest yet. Well over and polished so you’ll have a chance to take home one 100 manufacturers and other exhibiters have already of the dozens of trophies to be offered in these events: signed up to bring you everything that's new in the WW1 GLIDERS hobby... kits, engines, radios, accessories and every­ POST VWV1 (Military) HELICOPTERS thing in between. And, our famous Swap Shop will be POSTWW1 (Non-Military) SCALE R/C BOATS PATTERN RACING R/C BOATS In full operation with thousands of items, including SPORT BIPLANE STAND-OFFSCALE built-up planes, almost new radios, engines and on and OLDTIMERS BEST-IN-SHOW on with something for just about everyone. SPORT EXPANDED JUNIOR EVENTS PYLON R/C CARS Special Swap Shop Note Because of space limitations, only one built-up model will be allowed for each swap shop registrant. Show hours are 10 AM to 6 PM on both days. It's a week­ end you can’t afford to m is s .. see you there. For further Information, write to Larry DiRubbo, 167 Lindsey Ave.. Buchanan, N.Y. 10511.(914) 739-2827

WESTCHESTER RADIO AEROMODELERS. INC. can do. But read on, there’s still enough details applied to their full-sized coun­ boil down to only three planes: Bobby information to help you possibly lift off terparts, we can’t expect any better Blouch, LeRoy Webb, and Doug Brue­ easily rather than rip it off without the results, and those results could be shaber. In a fine racehorse start, with all requirements being there to allow it to disastrous, just ask any full-sized pilot three planes breaking ground together become an aircraft. what would happen if he just applied and reaching the No. 1 pylon at the same There are two basic types of drag: power, held the stick back in hisstomach time, it was short-lived as Blouch really rolling, or hydrostatic resistance, and and waited for it to lift off. Enclosed are turned it on to take a commanding lead. aerodynamic drag. Both of these are some diagrams which show some pre­ Webb cut out very shortly after and affected by the thrust line vector and ventative medicine for sick birds. · Brueshaber followed Blouch around for angle of attack of the lifting surfaces in the ten laps. In winning the final heat relation to both the takeoff roll attitude Pylon...... Continued from page 24 and the Doolittle Trophy, Blouch also and initial taxi-to-roll-out speeds. Full- turned his best time of the two days of sized aircraft have manuals which give laps while trying to keep up with Webb racing, a 1:29.2. the best airspeeds to lift the nose wheel and Blouch. Blouch turned a very re­ All in all, it was a super two days of (trading rolling resistance for aerody­ spectable 1:32.9 to just edge out Webb, racing, and I can’t recommend too namic drag), when to rotate and further thereby advancing Bobby to the 2nd strongly that you attend next year’s reduce this rolling resistance by taking elimination stage. event. off some of the weight from the dragging In the second heat between Gager, You also might note that running what undercarriage without adding greater Floyd Fitzgerald, and Gail Jacobson, is essentially two races in one creates a drag aerodynamically, whether the Gager cut the No. 2 pylon on the 3rd lap more interesting race, as it still gives the climb is initiated immediately after lift­ and shortly thereafter, Jacobson cut No. flier who may not be the fastest but has a off or whether the nose is allowed to 1 trying to catch Fitzgerald. little luck and flies consistently a chance drop and pick up further airspeed In the 3rd elimination round it was to win a first place trophy. It also gives before climb-out. This is determined Bob Reuther, Ron Bressler, and Al the hot-shots their glory by being able to largely by aircraft design, load, runway Grove. All three aircraft wereintheairat make the finals even though they may conditions, wind speed and direction, the same time and as they rounded the not have finished but one race, while temperature, etc. Aircraft do vary in No. 1 pylon, Reuther either touched one still setting a fast qualifying time. The these requirements, and pilots of full- of the leading aircraft or got caught in final elimination races carry with them sized aircraft require checkouts in their prop wash and was knocked from an excitement that parallels the high different types to take advantage of their the sky. Bressler and Grove both got school Sweet Sixteen basketball tourna­ good points and minimize their weak carried away in the excitement and both ments. The contestants at RR were areas. double-cut. interested enough to hang around for OK, where does that leave us? In ma­ In heat No. 4, it was Wayne Yeager, the outcome of the Doolittle race, jestic scale (spelled Mammoth Scale in Doug Brueshaber, and Tom Dudan. whereas at most contests, as soon as Model Builder), we are closely matching Dudan flamed out on the first lap and they’re out of the running for the full-sized aerodynamics in power load­ Yeager double-cut to advance Brue­ trophies, they pack up and leave. ing and the way the full-sized machine shaber to the finals. Costs to the club could also be kept handles. If we attempt to take off these The problem in heat three caused the down by having the qualifying fliers aircraft without regard to the same well-laid plans for a four-plane flyoff to supply their own prize money by charg- 104 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER ing them a $10 kitty fee with the winner taking all. MARINE VERSION HEY!!! Toledo’s not far away. Plan to the remarkablei be there .. . we'll see you at the Model Builder booth. · m fa Quadra ignition u engine

Electric...... Continued from page 67 long enough to set any records, but it is a MADE IN CANADA start. It has gained a third servo for on- off control of the motor, and weighs 18 oz. in this configuration. Speaking of world distributor indoor R/C, a natural scale model would and developer: be the Slits jr. featured in the October R. Shettler Ent. Model Aviation. I fly an ME 109 with n e w ! rudder only and the Astro 020, so the Pottery Road R-R. 3 low-wing configuration of the Stits Jr. is Vernon, B.C., Canada VIT 6L6 now available not a serious problem; just use more Telephone: (604) 542-4151 (a ll hours) dihedral than for a high-winger. A four- foot span model would qualify as almost 1/2-scale! It’s a wonder that the Peanut GET A HEAD! -MAMMOTH SCALERS- Scale fliers haven’t done this one. At a "More Go We have engine mounts for tor Less Dough” 13-inch span, there would be 78 square the WEBRA .91, SUEVA 1.5, inches, over half a square foot; the Fike • D-Varnishing Brushes MOKI 1.5 and QUADRA engines, "only” comes out at 55 square inches! , for .020-.60 ’· Fuel Bulbs 1 and 2 oz. plus a complete line of Until next time, charge ahead! · • T. D. Spring Starter • 1/4 and 1/2A Stax mufflers. Also available is • Heavy Duty Crankshaft a nifty throttle control unit for .049 Reed Eng. Sailplane Des. . Continued from page 49 • Tetlon Reed Valve for the QUADRA engine. more reasonable . .. after all an Oly II Send SASE for literature. Write for illustrated catalog weighs about that, and has 6.4 feet of Dealer inquiries invited. wing area. and prices. Sold DIRECT ORDER At this point, some clown is going to DIESEL CONVERTERS $9.95 ONLY. Immediate shipping on For .020 and .049/.051 .09 ask the inevitable: what’s to stop us from Ask your dealer or add $1.00 p&h to order direct all orders.______making the wing seven square feet? Or Diesel Fuel: Pt. $3.50, Ql. $5.00, $1 p&h eight? We may have decided on a Quarter Headquarters Davis Diesel Development Inc. P.0. BOX 12321 San Francisco. Ca. 94112 90-inch span, but can’t we make the BOX 141, MILFORD, CT 06460 chord as wide as we want to? Who says PHONE: (203) 877-1670 sailplane wings have got to be long and This month’s three-view comes from skinny, anyhow? two-meter class, Mark's Wanderer is Northern California. Called simply “The Well, the answer to that question is under 10, and way down in the saltgrass Elliptical”, it’s a multi-task (that is, FAI (and the engineers are gonna hate me country of South Texas, John Rimmer speed-distance-duration) design by for this one): nobody says they’ve got to flies his highly successful little Nemisisat Herb Semmelmeyer of Santa Rosa. If the be long and skinny, because nobody a record seven-point-fourl general outlines remind you a little of really knows how important aspect ratio So a lot of wing area can be packed Rick Walters’ “ White Trash” (MB plan is on model sailplanes! into a short span, at the designer’s No. 1723), that’s because Herb and Rick Aspect ratio, you’ll remember, was option. The practical limits are probably were collaborators for years, back in the defined last month as the ratio of length more aesthetic than aerodynamic, for early seventies. The airfoil (shown full to width (span to chord) of a wing. Thus a the performance range we need. For our size) is Herb’s own, a 10% section that 99-inch wing with an average chord of hypothetical Dream Soarer, then, why features a straight line from the trailing 8 inches has an aspect ratio of 99 :_8 = don’t we settle on an aspect ratio of ten edge upward to the 50% point. 12.38, right? You can arrive at this same to one, about halfway between that of number by squaring the wingspan and the Olympic and that of the Wanderer. An Vital statistics on the Elliptical are as dividing by the wing area, and that’s how AR of 10 would give us an average chord follows: 117-inch span, 1046 square inch I prefer doing it . . . "average” wing of 9 inches on our 90-inch span, so our area, aspect ratio 13, wing loading 7 chords can be a little tricky to figure, wing area would figureoutto9x90 = 810 ounces minimum to 15 ounces maxi­ mum (52 to 109 ounce flying weight), sometimes. square inches, or 5.6 square feet. Now stab area 13.5%, vertical fin area 6.9%. The fact is, our current "knowledge” our weight range becomes 33-36ou nces, Herb emphasizes that the plane shown or aspect ratio importance is derived if we want to say in the 6.0 to 6.5 ounce- is merely a simplified prototype of his from full-scale theories, and many full- per-foot class, and keep our "floater” scale theories simply don’t work when status. original dream, which was to have had full-span elliptical dihedral, a la the applied to model sizes, weights and That about settles our major para­ Midwest Hawk. The 18-inch elliptical tip speeds . . . in precisely the same way that meters, then: we’re designing a floater scientific "laws” of cause and effect of around 800 square inches, 9 x 90 inch panels were jig-built from spruce and balsa; Herb feels that the construction is break down on the subatomic scale wing, 6 to 6.5 ounce loading. All we need (don’t ask a nuclear physicist to predict is a floater airfoil (we can swipe it from probably "more work than the average where an electron is going to be at any our favorite floater kit, or pull it out of builder would care to tackle.” I’d have to add that the work was worth it, time, because he'll have to admit that he one of the sources given last month) and however, because the prototype I flew can’t.). we’re ready to put pencil to paper and had smooth and instantaneous rudder About all that can be said for sure begin scratching out . . . excuse me, response, in spite of what I consider about aspect ratios is that they seem to lofting . . . our Dream Soarer! Next "heavy” wingtips. be coming down: the current crop of month we'll talk about moments . . . U.S. competition craft are growing how long de tail ought to be, how big de Three Ellipticals have been built so far, stubbier wings. The Graupner "Cirrus” , stab. We’ll look at the moments of half a including one begun almost three years king of the heap eight or ten years back, dozen popular designs, and decide ago, and just now being completed by its had an aspect ratio of 17.3; the Paragon whose to steal. We'll call the lecture new owner, Pete Bechtel of Couer of today is down to 12.9, and the "Great Moments in Sailplane History”. .. d’Alene, Idaho. The ship shown in the Olympic II figures out to 10.6! In the MODEL OF THE MONTH photos is by Harry Menke of Santa Rosa. FEBRUARY 1979 WHEN CONTACTING ADVERTISERS’ TELL ‘EM MODEL BUILDER SENT YOU! 105 when involved in a heavy-duty match and when they are spending most of EVERYTHING their time watching the other guy’s model to see what he is doing or going YOU N EED to do. As if that isn’t enough, when in a TO KNOW match, you very rarely have the benefit of being directly overhead with a whole A BO U T 1/2 second to decide what to do, most of the time being much lower to start with. ADHESIVES! I Although Stunt models don’t fly MINI-ANTIC nearly as fast, they too provide a real COMPACT CAR SIZ E·.29 to.40 ENGINES - 56" challenge that sheer speed and dazzling SPAN -A REAL PLEASURE TO BUILD & FLY. turns can't match. The trick here is that ZAP the bottoms of most maneuvers are k NOW AVAILABLE FROM IT o ilO f ENT CORP World (amous! The strong down around 4 feet off the deck. Now, PO, BOX 9641,SAN DIEGO. CALIFORNIA. 92109 anybody can get that low with just a little one! The Iasi one! Holds M SEND *1.00 FOR COMPLETE CATALOG OF up lo 2000 lbs. per sq. in. AIRCRAFT, HARDWARE & ACCESSORIES.PLUS practice, but to do it on every single Bonds in Seconds. Patented A DESCRIPTIVE »M IN I* BROCHURE maneuver of every flight, and to do it so clean hands applicator. Also that the rest of the maneuver isn't available in Z A P G O LD , w ith m visible tracer bobbled from corrections to get the magic 4-foot pullout. . .that, friends, is a C /L ...... Continued from page 87 real trick. make it better, does it? The cost thing Back to the cost thing. Although I and aside, I still prefer to fly a good C/L many other C/L fliers have an invest­ X - 3 0 model over any R/C plane; a good C/L ment in our hobby that is quite sub­ model being a well-trimmed Stunt stantial and probably several times that Second generation ZAP. plane, honkin’ Combat plane, or of the casual R/C Sunday Flier,spending High strength adhesive can’t be equated to how much enjoy­ PLUS 30-sec. set time, groovin' Rat, Goodyear, or Slow Rat. Given the choice, I’ll even take a nice ment you are getting. Still, for the allowing adjustment of amount of money that I have spent on minor alignment problems. profile C/L over, for example, a Quickie Higher viscosity for filleting 500 R/C plyon racer. C/L equipment, I have had many, many slight misfits. The big difference is in the fact that models to play with and enjoyment that C/L flying gives you a positive and direct simply cannot be measured in dollars. feel of the model you are flying. A quick But the point is that for a certain amount move of the hand gives an instantaneous, of money, you can have one complete ZIP and exactly proportional, change in the R/C model, with maybe a back-up plane, EPOXY flight attitude of the model. You are or numerous C/L models that are always really flying it, and except in very rare complete and ready to fly, except for Pacer s premiere maybe changing an engine. With an R/C epoxy. T h e five circumstances, such as a bellcrank minute bonding pulling out, you are the one doing the set-up, you have to switch the radio agent that means amazing tricks and/or punching that from one plane to another if you want to business. From fly two different planes. ch e m istry to baby in theground. You areawareof the fact that 95% of the “ interference- I can remember being able to count simplified appll· over three dozen complete, ready-to-fly catio n tech n iqu e — caused” crashes in R/C are really pilot- the Cadillac of epoxies. error-caused crashes (brain fade), aren’t Combat planes hanging in the shop . . . you? in the middle of the contest season! I am This direct feel of the model allows presently down to only twenty (twelve very tight, precision flying, but it also Fast, three FAI, and five 1/2A). This is in shows up the mistakes, especially if you addition to a couple of Badyears, a Rat or like to fly very close to the ground. This two, one Stunt plane, a N.W. Sport aspect of C/L flying can be very exciting, Racer, an ancient Slow Rat, and assorted as you are just daring the ground to get foof that is buried someplace. Pacer you, if you make a mistake. For flying on By spending my money in C/L, I have r ^ r i— lfechnologM & the fine line between dazzling finesse participated in Go-Fast stuff. Precision and instant destruction, you just can’t Aerobatics, literally hours of Combat i / IH Resources beat flying C/L. matches, plus lots of sport and practice 1550 Del! Ave.. Campbell. CA 95008 / (408) 379-9701 If you have never flown C/L, and flying. An equal involvement in the R/C wonder how it is that a certain amount of event of the same nature (Pattern, Pylon Racing, and . . . oops, they don't have It flew in the 1976 LSF Tournament, held skill is required to keep from punching, R/C Combat) would have set me back a in Harry’s hometown. consider that a decent Combat model is lot more money than I already spent. Before you engineers out there whip flying around 120 mph if powered by a out your micrometers, let me point out current, competitive motor. At that No competitive form of modeling is that the signature on the three-view is speed, the model is going about 176 feet cheap, but if you like to try several different events, and do them right, C/L that of the artist, not the draftsman! The per second. With the model directly modeling is definitely an attractive way drawing is a 1/6-scale copy of Menke’s overhead, it only has to travel about 100 to go. ship, so it’s at least four stages removed feet before it hits. Right, you’ve got 1/2 from Plato’s ideal, as the philosophers second to relax a bit, deciding on what HOBBY/SPORT (?) say. (The argument goes like this: the you will do next. All the while the model In closing this column, I’d like to note three-view shown is the printer's im­ is still going 176 feet per second, only that there has been a lot said lately about perfect reproduction of Thornburg’s now it is 12 feet off the ground. Add in various forms of modeling being not just imperfect drawing of Menke’s imper­ there that the flier has to know how a hobby, but a hobby/sport. I’d like to fect model of Semmelmeyer’s imperfect much room it takes for the model to do state that of the usual modeling events manifestation of his own ideal of a multi­ the turn to upright or inverted flight, we see in the pages of MB, only F/F and task sailplane. And so much for human and maybe you can appreciate the fact C/L can truly be classified as having perfectability.) · that most of the competitive Combat anything to do with sport. In F/F, you fliers can time their pull-outs to within toss it to the winds and chase it. That puts two or three feet of the ground, even it into the sport category. In all forms of 106 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER C/L flying, there is some physical in­ volvement and stress that can mean the difference between being just good and being excellent. Why do you think they call stunt fliers Stunt Grunts? Have you ever seen a Combat match where it wasn’t almost as interesting to watch the pilots as it was the planes? How much strength and stamina do you think it takes to hold onto a 150-mph Rat? Or a 200-mph Speed plane? Where do you think the phrase "whipping” came from, and surely you don't think that whipping a plane faster has anything to MISS SAN BERNARDINO do with passively standing in the center K ll No. 255 of the circle, do you? In any C/L event, it is possible to be better at it by increasing your physical (Please Print) involvement and/or being in better U*Contiol Name: ______shape. Next time somebody tells you Address: ___ that R/C is a hobby/sport, tell him he City: ______can bite a big one. I’ve flown enough of ViA Racers State: ______Zip: both C/L and R/C to know better. .. · FOUR NEW SEND RACE READY COUPON AND Send To: Cliff hanger. . . Continued from page 52 DESIGNS 25« FOR JOIN THE YOUR MIDWEST PRODUCTS CO. glider seems to be floating by itself out at 400 South Indiana St MIDWEST CATALOG Hobart, Indiana 46342 the end of the line. It should fly at or COMPLETE TODAY! above your hand level, and show an KIT LINE! MB altitude change with inceased swinging speed. When you are satisfied with thetrim in brass collar, which is the stop. This works IN STOCK FOR IMMEDIATE SHIPMENT tethered flight, recheck that the ailerons well and a few minutes’ study will, I are set equal to each other and above hope, make the mechanism clear. Q U A D R A S $97.50 the elevator. This set-up gives you a And how to make a braided motor? Q UADRA R EP A IR - $10.00 plus parts washout effect which reduces tip stal­ Quite simple, really. The motor must Z IN G ER , PU N C TILIO , TO P -FLITE props ling. Once you have done all this, there consist of an even number of strands. I and DU-BRO BIG W H LS., 10% O FF! is nothing left but to charge the bat­ will desribe a 4-strand motor. Measure CONCEPT'S BIG FLEET KIT - $179.95* teries, do a range check. and then throw out your motor in the conventional BARKLEY'S TIGER MOTH, $225.00* Cliffhanger off a cliff. · manner. I use about 1-1/3 the length (* 6" Du-Bro whls., a $15.95 value, between the prop hook and rear motor F R E E with kits bought from us) Stormhawk . . . Continued from page 75 peg for each strand. Tie the rubber 1/4-SCALE PLAN S (for Quadra) STEARMAN BIPE, ERCOUPE framework, place a small drop of film together using a square knot with an $20.00 per set. overhand tied on top of it. Lay the motor cement. Capillary action will carry the 24-Hour Service. . . A dd S2.00 postage. cement around, and in 30 seconds or so, out in a 2-strand configuration. Find the Send Bank Check or Money Order to: the canopy will be bonded. You may center and mark it. Stretch slightly and JIM MESSER'S wind in about 100turns. Foldthewound then continue on the next section until QUALITY MODEL PRODUCTS your windshield is completely cemented. motor in half, making 4 strands. Attach your prop hook at the fold and put the 106 Valley View Dr., After the front and rear windshields are Allegany, NY 14706 in place, trim the celluloid overhang other two ends on the same peg. Now flush with the frames. The center section pull taut and let the propeller unwind. is then added. The trick to a neat job is The motor will twist around itself and outline. When the wood is dry, remove, not to glue the center section to the end up in the neatest braid you could coat with Ambroid, and put back on the upright frames. Cement it only to the hope to see. If it is now shorter than the form until dry. Some people use white top of the wing saddle on either side. distance between hooks, you will have glue and do the whole job at once, but I The small ply pieces that hook into the to try again with less turns. Chances are feel the Ambroid is better when it comes stab leading edge are also put on after that it will still be long. Don’t worry. Put to carving and sanding the outlines to the model is covered and with the stab in the motor in the model and wind it up their respective cross-sections. I do that place, in order that a good stab fit can be about 100 to 150 turns. Let it unwind. shaping first thing after the outlines are made. When stopped, you won’t see the neat dry from the glue. A propeller blank is shown on the braid, but rather lumpy knots distributed Sliced ribs were chosen for the wing plans. This propeller works much more along the motor. This is all right as long and stab ribs. I like the appearance of efficiently than a plastic propeller, and is as there is enough tension in the motor this technique and find it assembles as recommended for a good climb. to keep the nose plug from falling out. fast as solid ribs. I use braided rubber motors. This is an The knots will always show up in the Pin the laminated outlines to the plan. old-time trick and effectively prevents same place and the CG will remain Add the rib bottoms, which are 1/16 the unwound rubber bunches from constant. If you want to find the exact square. The spars are cut from hard 1/32 shifting around and changing the center number of pre-turns, you can get back sheet. First, cut strips 1/2 to 5/8 inch of gravity, thus upsetting the glide trim. to that perfect braid. wide from the sheet. Make them a little It is used only with a free-wheeling WINGS & STAB over-length. If the wood grain wants to propeller, as it offers no advantages with The leading and trailing edge of the distort and put a bend into the spars, it a folding prop. A braided motor is under wing and stabilizer are laminated from will now do so. From these pieces, using tension when unwound, and conse­ pieces of 1/16 x 1/8 balsa. You may make a long straightedge, cut your spars. quently requires a stop on the propeller a cardboard template for lamination, or They should come out perfectly true. snaft so the propeller is loose to free­ do as I did and use closely-spaced pins Lay the spars in place and glue them to wheel. I have included a sketch of the on the inside profiles. I wet the wood the rib bottoms. free-wheel clutch I use and the soldered with water and pin it to the laminated Make a template for slicing the ribs FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL ΈΜ MODEL BUILDER SENT YOU! 107 aluminum mandrel, also turned to the proper diameter. Then the outside was Greatest Book of turned, to fit the carburetor opening. A FULL-SIZE RUBBER FLYING fine saw slit was then made, which lets it come off the mandrel, and also allows it SCALE PLANS, plus to compress the necessary amount to building, trimming, and SCALE MODELS secure the carburetor after everything is flying instructions ever assembled and tightened together. O F W W I I The only other thing that needs to be published! mentioned is: keep it clean. Tape the fuel fittings and the vent hole on the pump plastic part during all machining Twelve half-inch scale Q # O · Q ♦ O operations, and rinse the whole thing in rubber powered flying solvent a couple of times. Brush and models by some of the 12 FULL SIZE PLANS blow, ultrasonic clean . .. you can’t overdo it. world's best modelers, Now, let’s see exactly what we have •UAUWMAM m HtUCAT • VOUCMT NUCOMAM accomplished, other than being able to including Doug Mc- • MlTWJHMMi ZSRO Hard, Clarence Mather, • •tAjVKOt M run a 34-ounce tank. This engine, which is definitely well broken in, was test run Bill Hannan, Bill War­ •Konnuu tssz Km • HU ΑΙΑΛΟΜΜΛ using K&B 500 fuel, in the following ner, Bob Peck and «MJOTMUNOCMHOlT• cuHttss n o r . combinations, with the results as shown. • M t # MUT AMS The prop used was a Top Flite 14x6 cut others. down to 13-1/2 inches, and slightly modified. Compiled and pro­ TOP RPM TIME PER OUNCE FEATURE ARTICLES ON STOCK 11,100 41 seconds ALL 1/24 SCALE duced by I.E. Coleman, <ΐΛΓ·η BUILDING, FINISHING, AND PERRY PUMP/ edited and published FLIGHT ADJUSTMENTS. WEBRA CARB 11,200 46 seconds by Model Builder Ma­ PERRY PUMP/ AVAILABLE NOW - $6’5 PERRY CARB 11,000 44 seconds gazine. SEE YOUR HOBBY DEALER, OR ORDER These are all average figures. The rpm, for example, was read a number of DIRECT. ADD FOR FIRST CLASS. times, from rich to peak, with each CALIFORNIA RESIDENTS ADD 6% SALES TAX. combination. For practical purposes, we FLYING can say it runs at 11,000 in any combi­ 621 West 19th Street nation. The Webra carb has a diameterof SCALE MODELS Costa Mesa, Ca. 92627 1/32 inch greater than the Perry, which may account for the few extra rpm with it when the pump was also used. In this from a piece ot cardboard. Cut rib stock Webra Pump . . . Continued on page 63 combination, the pump definitely af­ from 1/16 x 3-inch sheet. Make this stock fected running. It was tried immediately the exact width as the length of the ribs with the Perry pump, there is an arrow after the stock test was made, and with will be for your wing and stab. Now slice molded into the backplate into which it the previous needle setting, the engine the ribs. Make them a little thicker to is fitted. The backplate has to be installed was extremely rich, indicating that the allow a final sanding of the finished in such a manner that the arrow is always pump pressure was much higher than wing. Lay the sliced rib tops in and glue. up, regardless of how the engine itself is the normal fuel draw. The center section ribs are cut 1/32 inch mounted. Normally, most engines will It must also be mentioned that the thick to allow the center 1/32 sheeting to come with the pump installed for up­ Perry Pump/Webra Carb combination lay in flush. Dihedral is put in the wing right engine mounting. If it is to be has not been flown, so we can’t tell you using the plywood joiners. mounted on its side, the backplate must about its behavior in the air. The full FLYING be loosened and rotated 90 degrees. Perry installation in the air. lives up to all We have already talked about weight, In the case of the Webra .91, the back­ the claims made for it by the makers. propellers, and motors. Start with 100 plate mounting screw holes are sym­ The fuel test time is also the average of turns and work your way up. The original metrically located on the four corners, a number of 1-ounce tank runs. A one- required very little trimming. I fly to the so you can install the pump for upright ouncer was actually used; it was im­ right under power and glide. The plans mounting, and easily rotate it the re­ pressive to see the fuel level go steadily incorporate the incidences and down- quired 90 degrees for sidemounting, if down as the engine ran. At first glance, it thrust that the original model needed desired. looks terrible .. . forty-some seconds for good trim. The CG is 50% of the wing In case any doubt exists about the flats per ounce. But it calculates to less than chord, and is on the plan. Set your glide on the inside of the K&B backplate, a fourteen ounces for ten minutes for any circle with the movable rudder, and little explanation is in order. This back­ combination, and that amount of fuel is power circle with sidethrust adjust­ plate extends into the crankcase, and normal for many .60 airplanes, so it really ments. The lifting tail is there to control the flat spot, which must be installed isn’t all that bad. power stalls and works beautifully. This towards the cylinder, is there to provide The parts required are hobby shop is a docile airplane and mine proved clearance for the piston at its lowest priced at $23.95 for the pump-equipped easy to trim. You can expect one-minute position. In the Webra, the backplate, backplate, Perry No. 800, and $16.95 for flights in cool evening air, and two- with or without the pump installed, does the carb, Perry No. 900. The Perry mintute flights in warm buoyant air. I not extend into the crankcase, and no standard and pump carburetors are not had a seven-minute flight one day at external clearances have to be con­ interchangable. Both pump and car­ Taft, followed by a five-minute flight. I sidered. buretor are listed in Sig's 1978 catalog gave up after that, as my legs started The other lathe-made piece required and are on hand at Orange Coast giving out. If you put a folding prop on is a short aluminum insert to adapt the Hobbies. Addresses for both can be Stormhawk, put in a dethermalizer; you smaller O.D. of the Perry carburetor to found in our advertiser’s section. One will need it! I have enjoyed flying this the larger throat of the Webra crank­ distributor we know of who carries both airplane immensely and am sure you will case. I first bored out a piece of tubing to items is Great Planes Model Distributors, also. · the proper I.D. and pressed it on an P.O. Box 457, Champaign. IL 61820. I 108 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER am sure that there are many other sources, but unfortunately, we have few current catalogs here at MB, and we would welcome all shops and distrib­ utors who print catalogs to send us one so that we can provide our readers with better information regarding sources of ROM A IR the more uncommon items that we mention in our articles. RETRACTABLE LANDING GEAR SYSTEMS In the event that you would like to have an original backplate for the .91 on hand, in case you later decide to go without pressure, they can be ordered - m f H TT from Model Rectifier Corp., at $7.35 plus postage. * STANDARD MAINS * FLAT MOUNTED No, I don’t have the exact dimensions NOSE GEAR of the machined pieces. At the time this ReversibU-inboard or outboard cylinders whole operation took place, I wasn’t concerned with the size in inches, only that which would allow the necessary press fit. And really, it is important only to know that the procedure works, and to remember that neither piece has a lot of spare metal once the taper has been Γ removed. So go slow from then on, checking for fit after every cut. Try it, it’ll cure any fuel problems you may encounter. ·

Peanut...... Continued from page 83 bled from block balsa built to fit around the square cross-section of the Williams Bros, plastic thrust bearing. When the f wing is installed make sure that the strut joints are all secure and that the struts are strong enough. They have to take the pull of the wound-up rubber motor. The CO 2 shown here is the single­ HAND VALVE cylinder Brown and the standard fuel COLOR CODED HOOK UP TUBING tank. The filler is located on top of the nacelle where it is most convenient. The OTHER MODELS AVAIIASLI: •f.A .I. MAINS Cylinder Outboard —Not RovortibU tank is in an upright position in the MAINS for PIATT řW 190-D9 - with 3/14" Pr.formod Wito hull: you can camouflage it with a dum­ 00 ROTATION MAINS for F-40 Tomahawk or MU Cortair my pilot if you desire. Because there is a 'HEAVY 3/14" STRUTS on tpociol order only. certain amount of pressure associated with filling the tank, it is essential that and ORcomM£JuL TČ O M -A I TČ 'Relm di becauAa the sheet fill-in at the wing roots be t iie q ο λ α tkb tw y bed, and uthea a belte/v aetnact it strong enough to provide finger support deAignedyoa c m b e t I t u d llb&R0M -AI~R" for the filling operation. Use firm, rather than soft, balsa sheet. To install the ROM-AIR Retracts are featured in Dave Platt's new kit “ The DUELLISTS MARK II” . nacelle with the motor on the wing ** ROM A IR CHOICE OF CHAMPIONS requires that the tank be unscrewed from its top so the top can be inserted HHUM © RHOMPROUUCISMflNUmCIUniNGGOHP. through the small hole in the center section. This hole must be built into — 924 6 5th Street, Brooklyn, Now York 11219 the wing structure before the wing is covered. Be careful when making the coils in sheet balsa for the ailerons. Use soft the same contour, and the same can be the tubing for the motor installation. If sheet for the root fillers on the lower said of the wing ribs. Note, however, they are bent without some sort of side of the wing if the model is to be that the tip ribs are thicker material, and support to prevent it, they tend to rubber powered. Use firm sheet if the in the case of the wing, there are two kink, and if they kink, they will not allow model is to be CO 2 powered, because thicker center ribs. proper gas flow, and will quickly break the model will have to be held at this The hull is built using two side frames due to engine vibration. Use a round point when the tank is being filled. Add built directly over the plans. The side dowel to wrap the tubing around, full-depth balsa doublers on each side of frame has been hatched on the drawing making sure that the tubing is always in the center ribs in the area where the for emphasis. As the sides are drying on contact with the dowel at the point that hole for the fuel lines must be made. the plans, cut out the three bulkheads it is being bent. The sponsons that go on either side of and the centerline keel piece. A seg­ The horizontal and vertical tail struc­ the hull to provide lateral stability on the ment of a circle must be removed from ture is completely standard. Simply water, are simply little wings. Use light the keel piece to clear the CO 2 tank. assemble them over the plans. balsa for the leading edges to keep the Remove the sides from the plans and Similarly, the wing is built directly total weight low. Rib contours for the separate them, then cement them to­ over the plans. The two center ribs must three sponson ribs can be found on the gether at the tail post and add the cross lean outward slightly to allow for the side view. braces. The front three cross braces are dihedral, which is put into the wing after All ribs are actually shown only on the the bulkheads. Crack the side structure it is removed from the plan. Use very soft side view. The horizontal tail ribs all have to make the sharp bend at the step FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 109 This article started with a description MINI for HEAVY or LIGHT JOBS of flight problems, so the basic advice SAW Cuts most anything — metal, wood, plastic, etc. has already been covered. Make sure Comfortable that the center of gravity is at the point grip Recessed nose— C K 5 p Chip-proof for use in normally shown. This may require a little weight as handle hard-to-reach places far forward as possible in the noseblock Extra of the rubber model, but will probably blades not be required for the C02-powered 3 for $1.05 version. A little washout in both wings may prove helpful. Use surface adjust­ • Leaves minimum burr ments to control the gliding flight and use thrust adjustments to control the • 6 Blade 6" Blade—will not · Cuts metal powered flight. Have fun, that’s the positions twist or buckle (including spring steel) main idea. ·

• Compact—easy to store in tool box or drawer. Servo Rev.... Continued from page27 is confusing as to what direction it has APPLIED DESIGN CORP. · 738 Penn Street · El Segundo, CA 90245 moved, and using the longest arm will result in the best centering accuracy. Now, and only now, and after unplug­ BOATERS! A.M.P. · Specialitt in Vintage Aero prod­ uct! and all (mall model·. ging the servo, reverse the connections Start Your Marine Engine mentioned, on both the motor and the From Your Transmitter With WE CARRY: Vintage Aero, Flyline Model·, feedback pot. Check carefully to be sure Micro-X, R/N Modal«. C linic Modalt, SIG, that none of the very fine wire strands LECTRA-STARTER Hi-Flier, Peck-Polymert, F.H. Spöket, VL Product·, William· Brot, piu· SHARK and have gone astray and are touching TELCO (X>2 engine«. against anything other than the proper terminals. COMPLETE ACCESSORIES: Japan«· tb- tue in «Iver, blade Λ color·, imported rub­ Now, with the servo facing you, turn ber, prop· & acceaaoriat, Megow, Continen­ the system power on and observe the tal & Ideal replica kitt, book·. Peanut baba, direction that the output arm moves. plan·, and moral Re-center by turning the pot in the CATALOG SI -THIRD CLASS RETURN. direction that you previously deter­ What could be more exciting than start­ 56 page· of tha fineet model· & (upplia·; in- mined would be necessary. After cen­ ing your manne engine with the boat in dud« FR E E Peanut plane plan. tering, tighten the pot holding screws the water, while you are standing on the and check for total travel and direction beach, ideal for the competitor, sports Senå SA .SE. for current price lití enthusiast and the scale modeler. of rotation, which should now be re­ AIRCRAFT MODEL PRODUCTS versed. You are now ready to reassemble All LECTRA-STARTER systems are e- quipped with a patented clutch assembly BOX 318, SCITUATE, MASS 02066 the case. Be sure that the amplifier goes which disengages when the engine starts, in exactly as it came out, with any allowing your engine to run up to full padding or insulation that may have speed with no power loss. used between these top stringers and between the last two bulkheads for the been installed, and that none of the Unit fits entirely into your model. wires are pinched anywhere. Recheck CO 2 model. It has a hole in it to just fit 'Sim ple servo operation. for normal operation again. The degree •Completely waterproof. and thus support the top of the tank. of throw and everything else will be Complete package includes all hard­ This area is simply covered with tissue ware, mechanical, electrical compon­ for the rubber-powered Libelle. exactly as it was; this change affects ents and battery. The windbreak can be cut from file rotational direction only. Do not over­ *25-50 starts per charge. card stock or any thin cardboard or tighten any of the case screws; it is 'Light enough for a .20 size model or heavy bond paper. It wraps around and necessary only that they be snug. Check powerful enough to start the largest for proper operation once again, and if it high compression engine. is cemented at each end to the second is still OK. you are ready to fly. •Can be used to restart a stalled en­ bulkhead. It is also cemented all along its A few servos, such as some of the MRC g in e. bottom edge to the deck. For prices, information and literature, series, use a sealed pot on which the c o n ta c t: EASTCRAFT Cover the model with tissue. After all element is not movable from the rear. SPECIALTY PRODUCTS M a rin e Div. parts are covered and the tissue has Adjustments in centering are made via 709 Longboat Avenue been shrunk with a mist of water, dope an external screwdriver slot on the top Beacnwood, N.J. 08722 the model. A seaplane has to be water­ (201) 240-3882 of the servo case. The procedure is the tight, so a little more dope than you same: reverse the two outside wires on usually use may be required. Inspect the the pot, those on the motor, and re- bulkhead. Just behind the step bulkhead hull and sponsons carefully to make sure center. add a 1/16 x 1/8 cross piece between the all sides have received enough to make Simple, right? Once around, and you bottom longerons. Cement it to the them watertight. The aft skeg and the are an expert. Just don’t forget the basic bulkhead all the way across, as well as to hull and sponson strakes are added after precautions, and that the life of your the longerons on each end. the hull has been covered and doped. bird depends on your proper soldering, The nose of the hull is made from They were made from model railroad no short circuits . . . and don’t forget to block balsa. Hollow it as indicated by the basswood stock and should be given a tighten the pot screws. dotted line. A top panel of 1/16 sheet final coat of dope after assembly. This conversion will work on all balsa extends back to the second bulk­ The original Libelle had an 80 horse­ modern digital servos, IC or non-IC, head and provides a deck. A long power Siemens five-cylinder radial three or four-wire. The only exceptions narrow triangle of 1/16 sheet on edge engine. Williams Bros, plastic dummy will be some of the 180-degree servos, makes the top center shape of the hull cylinders with dress snap heads are used which use different methods of extend­ from the step bulkhead to the front of to simulate the engine details. The ing the throw, and for which the above the tail.Sticks of 1/16 square balsa are original airplane was aluminum, so the procedure might not work. As in any added at the top of each side of the aft models can be covered with silver tissue case, when doubt exists, return the part two bulkheads. These bend sharply at or lightly sprayed with silver lacquer to the manufacturer or one of his the step bulkhead and then are ce­ after doping. Avoid a heavy paint job. centers for service. Have a happy back­ mented at the top of the centerpiece Movable surfaces are indicated by black wards flight! · two bays further aft. A sheet balsa filler is lines.

110 WHEN CONTACTING ADVERTISERS, TELL ΈΜ MODEL BUILDER SENT YOU! MODEL BUILDER Fuel Lines .... Continued from page 61 as shown in the photographs. It will fit snugly into the end of the tank body, and will be easy to solder together. Next, attach the brass tubing lines and vent. A typical metal scribe can be used to punch the holes in the tank for the tubing. Add the alligator clip and a holder for the latex tubing shown in the photograph of the completed tank. A simple piece of solid copper wire will do as a holder if a terminal-type washer, as shown, isn’t handy. Use a solvent such as acetone to thoroughly clean the tank of any solder­ ing flux residue, and then install the other end of the tank. Test the tank for leaks by immersing it in water and applying breath pressure through an ordinary piece of fuel line. Bubbles mean leaks, and that’s a no-no on uni­ CANADIAN flow tanks. If there are no leaks, fill the MODEL tank with water and then boil it in a pan of water for fifteen minutes. This will EXPORTERS decontaminate the tank of any remain­ ing solder flux. Empty and dry it, add the 88 Wingspan Scale TIGER MOTH· Quadra Engine latex rubber vent tubing as shown, and Plans & Construction Manual 'CURTISS HAWK P6E ‘ STINSON RELIANT SRfl it's ready for installation in your plane. V« Seal· 04 VSpan ·22.*> r4 Scale 120' Span »2 5 »° 2'Scale 03" Span *12.»0 2*Scale 84* Span *19 »° Here’s the fueling sequence that 1>j" Scale 47 VSpen »10.50 1V Scale 63" Span *12.·° works well with this type tank: Place the •CURTISS GOSHAWK F11C* T Scale 03* Span 019.®° fueling bulb on vent “ B” , depress the •CURTISS GULFHAWK 1A alligator clip, squeeze in fuel until it • ■ « 2~’Scale Q3~ Span »19 » New U Scale P4V span *3Q°° Wwa ΚΛΛ 41 *0 P»r Orau, for Potug· *nd Manmina squirts out the overflow line, release the OutakM UO Add 11ου Mak· al I Payment · to: Richard G. Barron h o i i v s p r in g u v alligator clip, and continue squeezing GrandSand at Blanc. oo tor CompleteMichigan mton 4843» the fuel bulb for about another second to be sure that the fuel line to the l i t p r ie · $225*00, plue $8.shipping and handling carburetor is full, and to also provide a of the model engine manufacturers B.C. residents please add 5* Sales Tax bit of prime in the carburetor. found themselves with huge inventories That about completes your 1/2A C/L of ignition engine components. These racing tank. Although a basic tank is a components represented a consider­ little simpler and will function ade­ able investment, and to just scrap them quately, the uni-flow tank is superior. and start over would bankrupt many of You’ll find that it's easier to set and hold the small companies. They merely re­ a consistent mixture. That and the pit moved the ignition parts from the stop are what win races. · crankcases, put small covers over the CUTE FAHBT Kaeaoth Scale Sport/Trainer fo r QUADRA machined areas intended for the igni­ Plana now available - sheets 85 a q .ft. U5I30.00 BERNHARDT plue $3*50 airmail postage. Float plana $6.00 and tion points, substituted a glow plug for ■ki plana $3*00. Ski Eit $29*95 each postage paid the spark plug, and PRESTO!, you were • Sea l-k it planned soon · FACTS & SUPERSTITIONS Send $5* for information pack of history and then looking at the most modern new developaent plus pictures and reduced plana. OF IGNITION OPERATION style glow engineavailable. Well-known • Many are the questions that have We accept bank drafts, money order», companies such as Ohlsson & Rice, 7ISA or KASTERCHARÖE cred it cards, come across my desk since I started Forster Bros., McCoy, Orwick, and many (please state card number and expiry) writing my little column for Model others took this easy route to enter the Canadian Model Exporters. P.O Box 23142 Builder Magazine. Some of the ques­ glow plug race. No other changes were Vancouver. AMF. B.C V7B 1V6 tions are profound and beautifully necessary. Many of these original glow presented, while others border on plug engines exist today in the poses- rumor and are accepted by a few just sion of model engine collectors. together with a large prop and running because somebody heard it from some­ the engine slow for about an hour is the one else. The theory is "if you hear it The word "po rting” refers to the best way. Others feel that the engine often enough, it must be true’’. Well, the timing and efficiency of the transfer of should be run in at a high rpm because it fact is, this theory is very often not true. fuel vapors from the time it enters the has a "memory” , and if it is operated at a Let’s examine a few of these beliefs and intake tube until it arrives into the low rpm to start with, it will never beany judge them on facts. cylinder. It makes no difference if this good for high speed operation. Still How many of you readers have heard fuel vapor contains glow fuel or gaso­ others feel that no harm would befall others say that converted glow engines line: the efficiency is the same. What the engine if it is mounted on the model do not make good ignition engines does make a difference in performance right out of the box and flown as long as because the porting is not correct for is the compression ratio of the engine in it is not operated at wide open throttle. gasoline operation on ignition? When respect to the type of fuel being used. W ell, if you value your engine and asked to elaborate on this answer, Each type of fuel will deliver maximum desire the utmost in performance after many "experts” say this is a well-known power when humidity, temperature, air breaking it in, you had better disregard fact dating back to the origin of the glow pressure, compression ratio, and rpm the above advice. It is of the greatest engine, but for some reason, they can’t are matched for that particular fuel. importance that you understand what seem to put their finger on the technical Another popular belief among some you are trying to accomplish when explanation of why this is so. Fact is, the modelers is in the correct way to break- breaking-in a newengine. Breaking-in is statement is false. When glow engines in a new ignition engine. Some feel that the process of mating two sliding sur­ became popular following WW-II many using a rich mixture of gasoline and oil faces (i.e.. piston and cylinder or crank- FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 111 power supply while the reading is being Fine Model Airplanes is our Game! taken. The advantage here is that your Perfection is our Name voltage reading will be true while elec­ Micro-Excellent Products! tricity is being drawn from the battery, just as it would be when the battery is in Shown in Picture use. Peanut Scale If you-like, a simple load device can be Piper Cub made up which will not only work with Stinson 125 your voltmeter but also give you a visual Semi-Scale indication of what is happening. Simply Taylorcralt take a number (probably 2 or 3) of auto Stinson Voyager light bulbs of a suitable voltage rating Realistic Background and create a harness of these in series Margie! which can be connected to your power supply. All Ni-Cds are rated in ampere- Send lor Catalog $1.00 hours. In other words, the rating is how Mlcro-X-Products much capacity they have for one hour’s P.O. Box 1064-A Peanut Scale $4.25 Indoor/outdoor operation. You should use a number of Lorain, Ohio 44055 Semi-Scale-C02 $5.50 outdoors bulbs in your harness so that when it is connected to your fully-charged power supply, the bulbs will go out after being to preserve the precision fit between the connected for one hour. The resistance crankshaft and crankshaft bearing. of the bulbs varies so much that it is COVERUP! Nothing will ruin this bearing quicker difficult to tell you just which type will Sturdy, dark green vinyl covered then an out-of-balance prop. Choose a do the job exactly as you need it: it’s prop of low pitch that will allow your better to “ cut and try” . binders for your valued copies of engine to really turn up without putting We should not have to discuss the MODEL BU ILD ER. Gold logo. a strain on it. many battery testers and cyclers that are Continued next month. · available commercially. If you would be so inclined, the purpose of one of these R/C Forum ... Continued from page 25 can make an excellent investment. Most of them are sophisticated instruments, Other than what is the difference thus a bit expensive, but because of this, between types of batteries, the question they do a fine job of checking batteries. most often heard is how to use the Ni-Cd CHARGING NI-CDS batteries to get the most from them. Most everyone understands that there There are some simple guidelines which, is a limit to how many times Ni-Cds can if follovyed, will provide as good a be recharged. Thus, there is a mental performance as can be expected, with­ resistance to charging them unneces­ out using a very sophisticated proce­ sarily. However, it should be understood dure. Let's list such a simple procedure. that most manufacturers guarantee at CHECKING THE CONDITION least 1000 cycles, and in reality, that is a OF NI-CDS lot. The expected lifespan of a Ni-Cd is Some instrumentation is required to generally 3 to 4 years, no matter how it is check any type of a battery, including used, which can translate to over 300 Only $4.95 each, two for $8.95, three Ni-Cds. With other types, a voltmeter safe cycles per year. In other words, it is for $12.95, four for $16.95, or five will do a respectable job, simply because difficult to run out of cycles during the for $20.50, postpaid in the USA. Out­ the capacity (electricity available in it) is normal lifespan, as the average modeler side the USA, add 90 cents per binder. more or less related to the voltage. With would use them. A good axiom is. if in California residents add 6% sales tax. the dry and lead-acid types, as the doubt. CHARGE! capacity diminishes, so does the voltage. A Ni-Cd will dissipate about 10% of its NOTE: One binder holds 1971 and 1972. Thus, if the voltage reading is low, you charge in a week to 10 days; after that, Use one binder per year for 1973 to present. can expect that the capacity is low also, the capacity will reduce more slowly. A (For UPS delivery, add $1.00 per binder) unless, of course, there is a mechanical Ni-Cd which is used often can be more problem. trouble-free than one which is not. They With a Ni-Cd, the voltage is almost like to be used! MODELS stable. However, there is a small drop in During periods of little use or storage, voltage as the capacity is diminished. the charge should be replenished at BUILDER With experience, this small drop can be 621 W. 19th S t„ Costa Mesa, Ca. 92627 regular intervals. They should not be left used as an indication of the battery's in a discharged condition. During condition. By using a simple voltmeter storage times, charging monthly has shaft and crankcase bearing) into as and carefully recording the voltage proven to be a safe guideline. perfect a fit as possible. Too harsh a readings you get from a power supply break-in can actually ruin a new engine under various discharged conditions, Another safe practice is to charge in short order. Too gentle a break-in will you can develop a reference which can before every (lying session. Overnight is take forever. A good procedure for a be used to give you an indication of the best, but if there has been a charge proper break-in is as follows: Ni-Cd’s condition. Probably the most recently, just a few hours will suffice. With your engine mounted on a reliable way of using this method is to These rules have been made assuming sturdy bench mount and hooked up for note a voltage reading taken from the the use of chargers that are furnished for ignition operation with coil, condenser, power supply when you know it has a use with the particular power supply: and batteries, fill the fuel tank with a low full charge and is in good order. Any this way, you have a matched system. If nitro glow fuel. This will hold the lime you see a reading below this one, the charger is something else, then you working surfaces of the piston and be suspicious. If the reading should be must be sure that the charging rate is not cylinder to a low temperature. Heat anywhere near the lowest reference you more than 10% of the batteries' ca­ should be minimized during this period have, find the cause before using the pacity rating. Example: with a 500 mah to preserve the quality of the lubricating batteries. rating, the charging rate should be no oil. Distortion due to heat will also be The use of this system will be even more than 50 MA. eliminated. A balanced prop is essential more reliable if a “ load” is put across the We now have what are known as “ fast- 112 WHEN CONTACTING ADVERTISERS, TELL ΈΜ MODEL BUILDER SENT YOU! MODEL BUILDER charge” Ni-Cds, and chargers to go with them. Fast-charging can be dangerous. Λ new CLASSIC kit " See your dealer It is therefore important to pay close NOW attention when fast-charging is used and to follow the instructions closely. Fast­ charging can be helpful by reducing time when it is essential, however, if the charger is not shut off at the proper time, No.107 it can easily ruin the batteries. The safer way is to use the slower charging method which can, in emergencies, be left on for The Fairchild "22" moderately extended times without damage. 48"span GREAT MEMORY .09-.15 power There has been information put out 3 channels r/c - that Ni-Cds can develop a "memory” . It AO" span, .09-25 power S 2 9.95 is said that if the battery is used re­ U channels r/c- $34,95 peatedly for a specific length of time, FLYLINE MODELS, INC. then charged for a precise length of time complete catalog-25C 2820 DORR AVENUE (B-2) repeatedly, it will become accustomed FAIRFAX. VIRGINIA 22031 (703> 57:*-2038 to this procedure and will not like to operate in any other manner. The clue Ct*·!· t lim n here is the use of a precise cycle. We modelers seldom do anything twice in the same manner, so ‘‘memory” is probably something which we have little to worry about. From experience, the only case which could be called memory has been little-used Ni-Cds which have been stored in a discharged state for a 6 RUBBER SCALE PLANS lengthy time. Sometimes these ap­ COMPLETE PLANS SHOW ALL PARTS. parently "dead” cells can be brought BOTH W ING S. FULL STAB. PROP BLANK. back to a usable condition simply by SCALE SOURCE REFERENCES repeatedly charging them. Many times, 20 Folkorts SK-2, 20 Crosby CR A. of course, this approach does not work, 13'Chambermaid. 13" Folkorts SK-2. and even if it does, the cells should be 13'Floyd Bean. 15 Smirnoff Bearcat Set $ 5 °° Postpaid Foreign add $ 1 5 0 thoroughly tested before use. H ui H

D A TE R E C O . SOCIETY OF ANTIQUE MODELERS

MEMBERSHIP APPLICATION NO. DO NOT W R ITE IN TH IS SPACE I hereby make application for individual mamber»hip in the Society of Antique Modelers.

NAME ______B IR TH D A TE ______YEARS MODELING

ADDRESS CITY STATE ZIP Please check if you belong to any of the following Note: Membership includes 15% discount on one year M ODEL B U ILD E R Magazine subscription. Give S. A. M. No. when subscribing. A. M. A. NO. Enclose Membership Dues of $5.00 and send to: Society of Antique Modelers M. E.C. A. N O .. 1947 Superior Avenue Whiting. Indiana 46394 S. A. M. CH A PTER NO. , In making this application for membership to the Society of Antique Modelers, I agree to abide by the rules set by the Society and realize that the goals of S. A. M. and the Old Timers movement are to encourage participation above competition and is dedicated to the preservation and reproduction of vintage model aircraft. ______Signed ------

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portant to be winding up as the tail end FREE FLIGHT of this column, but better here than not RUBBER STRIP at all! The AMA of the U.S.A. and the HARDWARE FAI RUBBER: ENDORSED BY BEST V_____TOOL», ACCKBtORIK» Λ PREC/MlOM CA9TIMG9 MAAC of Canada have initiated a pro­ U.S. RUBBER FLIERS. MADE IN U.S. gram to update and enliven FAI Pylon WINDING N BALSA SIZES: 1/4", 3/16", 1/8", 3/32", 1/16" racing. A considerable amount of effort HOOKS STRIPPERS 1mm THICK (.042). SPOOLED, and work is being put into the program, URL IMITEO TO PKANUT »·" AMO 3 » ” LKMOTM» GROSS WEIGHT 1 POUND. with the hopes of adding to our pylon PRICE - S9.10 PER SPOOL PPD. IN 190 MOUNT racing sport. The goal is to increase this cJETEX MOT WIRE EIRELETOW U.S. AD D ITIO N AL SPOOLS, $8.60. racing activity with a resulting World

PLAT» NEW PIRELLI Championship and all the prestige that EØUPE HUB % T KIT HOOK 9 SIZES: 6mm, 5mm, 4mm BY 1mm. goes with it. This can only add to the RACIAL KIT»: KORATfR t», ΚΑ» ■MOINK MOUNT. TORPEDO. OAR AND 23 image of all pylon racing. It is fortunate NEW 1 f o r o r *■ 10 PRICE: S13.00 PER HANK PPD IN CATALOG 9 t.00 U.S. ADDITIONAL HANKS, $12.50 that as things now are, this event can revert back to scratch and become JIM CROCKET REPLICAS Í SOLE U.S. DISTRIBUTOR AND WORLDWIDE SALES. something much different than it has 144E N. FRUIT AVE. been. It is admitted that the event has FRESNO. CA. 937E8 not been popular in the past, but there is P 0, Box 9778 also no reason why it could not be a by the crankcase pressure of the engine. Phoenix, Arizona 85068 premier racing event. What apparently Crankcase pressure is a result of the is needed is an event which would be displacement of the engine. When the rpm of the engine. If a venturi can be attractive to a great majority of R/C’ers. piston is at top dead center, the case produced which will provide a lower We need to know what type of a racing pressure is one factor. When the piston pressure than a normal type does, then event would be most attractive to a large comes down, it compresses the gas in this amounts to the same thing as in­ number of modelers. Any ideas which the case equal to the amount of dis­ creasing the pressure on the other side you may have in regard to the FAI Pylon placement. Normal engine design yields of the needle valve. Probably, experi­ event would be greatly appreciated and about 3 lbs. of base pressure. The menting with the shape of the venturi can be directed to me. · problem is that the 3 lbs. is practically can be of some advantage in this respect, constant, no matter what the rpm may however, experience indicates that any Pusher...... Continued from page 44 be. Thus, if you need an increase of fuel real gain can only be had by reducing pressure, this system cannot provide it. If the size of the venturi opening (throat). Model Airplane News, under the title we use a fuel flow adjustment (needle Inasmuch as the power of our engine is “ Build this Pusher that Goes Places” . The valve in our case) which is set on the directly related to the amount of fuel title refers to the fact that on June 17, ground, the only way the fuel flow can mixture it can absorb in each revolution, 1932, Harry’s model set an official N.A.A. be increased is by increasing the pres­ keeping the largest size venturi possible Outdoor Scientific Single Pusher record sure. With a set amount of pressure is most important. Apparently, the best of 1 hour, 38 minutes and 10 seconds, available and a fixed adjustment for fuel that can be had from this approach is a and covered a distance of better than 8 flow, we have a problem when more compromise, and a compromise is never miles. That’s pretty darn good for any fuel is needed. While Terry did not have the final answer.. . model! a specific answer to the problem, he was For my part, I can say that I found a Besides being an interesting change of good enough to confirm my own find­ "fix" which worked quite well and pace, this little ship could do well in ings. Apparently, a number of modelers allowed me to continue my experi­ today’s O.T. rubber events. Or, if you in his area, from various aspects of ments. which were with propellers. really want to shake up the troops, modeling other than Pylon racing, have However, the in-flight mixture control modify the design slightly and fly it in seen the problem, even though to a which I resorted to is not the cure the P-30 event that is rapidly becoming lesser degree than I had. This confirmed needed. We need a system which auto­ popular. The wing would have to be my feeling that it was a problem which is matically feeds the needed amount of shortened by one false rib bay on each affecting us all. and if an answer could fuel, no matter what the rpm may be. tip to get it down to the 30-inch maxi­ be found, we all would benefit from it. Terry provided some ideas, confirmed mum allowed, and he fuselage would that the problem is widespread, and have to be shorten* d an inch or so, so Terry indicates that some work has been opened the door to any others out there that the total length, ncluding the prop, done with carburetor venturi design, who may have some ideas. They cer­ does not exceed 3u inches. Also re­ resulting in some improvement. The tainly are welcome! quired are a stock 9-1/2-inch free­ reasoning behind this is that the airflow A final request before closing this wheeling plastic prop and no more than through the carburetor is linear to the month. It probably is much too im­ 10 grams of rubber. Keep in mind that if 114 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER you make these changes, the model will no longer be legal for Old Timer competition. As is the case with many O.T. models, no balance point was shown on the original plans. So, to get an approxi- matestarting point, we used theformula on p. 20 of Frank Zaic’s 1935-36 Year­ book, and came up with a balance point 4-1/4 inches forward of the l.e. of the wing. From there on, you’re on your own. If you build one of these models, be sure and let us know how it flies, and if possible, send us a photo! ·

Instructor. . . . Continued from page 11 the tip speed too high in flight, resulting p F Λ I |C\JV SCALE ACCESSORIES in extremely high in-flight noise as well as too high a vibration level. In this case, I\I_/ i LIO IVI · BY WILLIAMS BROTHERS a 15x5 or 14x6 is the better choice to RADIO CONTROL SCALE PILOTS · SCALE WHEELS keep the tip speed down. CONTROL-LINE CYLINDERS · ENGINE KITS · MACHINE GUN KITS Propeller efficiency is a subject we haven't touched upon and this is as good FREE-FLIGHT PLASTIC DISPLAY MODELS a place as any to insert it. as it will play a SEN D 5 0 :> 96 A XIFLQ 049 29 50 FOX ENGINES Easy Flyer 116Ö0 15Schn 19.56 60 Trainer 60.75 Dumas 21600 15 Schn R /C 26.56 Hemkel He-162 53.95 Heritage 12 Meter 21900 19 R /C 25.86 22500 25 R /C 21.60 SIG R/C Sailboat 13500 35 Stunt 19.56 Kadet 27.68 13600 36 19.56 Kougar 35.60 13700 36 B B Combat 34.96 Komander 30.50 Only $180.00 23600 36 R /C 25.66 Citabra 45.94 24500 45 R /C Schn 36.35 Chipmunk R/C 47.52 26099 60 BB Eagle R/C 48.95 J-3 Cub 30.50 Clipped W ing Cub 30.50 Sm ith Mini Plane 39.60 Fox Tanks W heels All in Stock Doubler It 19.80 M ulders 25% O il List Super Sport 15.84 BATTERIES Liberty Sport 50.50 Nlcads GOLDBERG Sig Mmow 22.18 1.98 1.25 V 2 Amp Ranger 42 A R F 19.16 C essna 150 55.44 1.79 1.25 V 1.5 Amp Falcon 5 6 II 34.95 Mustang Slumer U/C 22.18 1 25 V AA 500 MAmp 1.75 Sr. Falcon 44.75 Seated Lead Jr. Falcon 9.55 SO AR C R A FT 105.30 12 Volt 1 9 Amp 19.75 •NEW* SKYLARK 56 II 34.95 Magnum 12 81 00 Jr Skylark 195 Glastlugel 604 A IRTRO N iC S 72.90 Skylane62 J4.75 Diamant Q-Tee 20.09 Libelle 64.80 Square Soar 22.75 Centurion II 42.75 Gere Sport 36.55 HUGHEY BOATS 32.40 84.95 Launch System Queslor 31.95 'N E W Dumas H uson 119.75 20 Rigger 92.50 Aquila St 63.95 Etchells 50/800 163.95 40 Rigger STERLING MODELS 66.75 16.49 Olym pic II 45.75 Easl Coast 12 Meier 19 Hydro Min Fiedglm g Acro-star 82.49 Fiberglass 160.00 Puddle Jumper 12.75 Probar Sail Unit 35.95 K & B Fledgeling 31.49 BRIDI 6711 19 26.95 Corsair F4U 23.75 T-10 Trainer 18.75 6712 19 R /C 33.75 T-20 Trainer 29.95 Dumas Hardware 25% Oil Current List 8450 3.5 F Rotor 41.75 S T E V E MUCK RCM Trainer 40 37.49 7860 35 Plain Bearing 21.95 North Wind 40/60 Mono 44.95 RCM Trainer 60 44.95 36.75 DUMAS Scale 7861 35 R /C 25.65 Lit Lightning 21 O B RCM 15-500 29.95 82.50 PT-109 26.50 8600 5.8cc FF Racing 69.65 Bushwhacker 20 Hydro RCM Sportster 29.95 8380 3 5cc R /C 48.50 Lil Northwind 20 Mono 42.75 Super Kaos 40 39.31 Coast Guard Lifeboat 37.90 Tuna Clipper 31.25 8382 3 5 cc Outboard 72.95 Super Kaos 60 52.49 8011 40 R /C 42.25 SURE FLITE MODELS Shrike Commander 138.95 Little Shelley Foss 28.50 Shelley F o ss 51.95 8360 40 R /C Pump 60.49 J-3 Cub A R F 28.50 Dirty Birdy 40 44.25 904040RSII Marine 72.95 28.50 P-51 Mustang 97.49 Coast Guard 40' U tility 30.50 Spitfire A R F 6525 61 R/C 57.49 84.49 T-6 Texan 97.49 Dauntless 43.20 7' C ilabria 653561 R/C Puniper 74.25 A7-A Co rsair II 22.50 Quickest 500 29.95 19.95 RCM B asic Trainer 29.95 DUMAS Hydro & Deep Vee Baby T urkey Dirty Birdy 63.75 AVL-1 Atlas Van Lines 7.85 LANIER AVL-40 Atlas Van Lines 40 36.95 Comet II 43.95 Soar Birdy 13.50 Pay n Pak 27.00 TOP FLIGHT MODELS Cessna 34.85 46.35 Hot Shot Tunnel Hull 20.95 P-51 Mustang Pinto 34.85 46.35 PICA P-40 Warhawk U-76 Hydro 34.95 Jester II 55.15 46.35 RC-2 T-28 B 69.95 P-39 Aircobra DV-20CF Deep Vee 20 Rebel Bipe 74.75 63 95 RC-3 FW 190 69.95 Competition Fiberglass 50.95 P-47 Thunderbolt SES-A 46.35 RC-4 W ACO F-3 69.95 DV-40CF Deep Vee 40 MARKS MODELS School Master 11.60 Competition Fiberglass 64.95 Windward 72 25.80 Freshman Trainer 35.95 DUMAS Sail Boats DV-60CF Deep Vee 60 W m d!ree99 35.25 Hobie Cat 7.75 Competition Fiberglass 69.50 Bushwacker w/o access 35.25 Alcort Sun Fish 13.75 DV-10 Mahogany 7.85 Wanderer 15.69 30 Star C lass 33.75 Deep Vee21 1313 29.95 Sunny 25.80 45 Star C lass 79.00 •NEW* Atlas Van Lines U-1 33 25 WindfreeRTC 107.61 Bingo 50/800 Fiberglass 180.00 •N EW Hot Shot 21 Wanderer RTC 53.77 1.5 Amp 1.25V Surplus Nlcads 219 Lightning 14.25 Glass Kit 47.25 Trainer 40 RTC 78.29 Super Slim

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POSTAGE AND HANDLING and insurance orders up to $5 0U add 95 $5.01 to (a) C O D within 48 continental states only $10 00 add $1 50. $10 01 to $20 00 add $1 95. $20 01 to $30 00 add $2 50. $30 01 P lease add $3 00 to $40 00 add $2.95. $40 01 to $50 00 add $3 50. $50.01 to $80 00 add $3 95. over (b) Outside 48 Continental States add $10 00 for actual $80 01 add $4 50 Send money order or certified check for fast service APO s postage and handling, excess will be refunded welcome Expon welcome Prices subject to change some quantities limited Note Arizona residents add 4°0 sales tax some of the larger fiberglass kits are sent freight collect best way available Reserve (C) BankAmencard Visa and Mastercharge welcome the right to clear checks

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FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL ΈΜ MODEL BUILDER SENT YOU! 117 ably less crowded, I recall. The Babe Bee etching is there because it is really a beautiful piece of artwork, JOHN POND and to remind you that the engine is still alive and well and living in Santa Ana. That Big Black Momma with a pair (of Old Time Plan Service engines) hangin’ out is Flight Dynamics' A-26 Invader kit. Priced at $49.95, it can The largest «lection of plans in the world at the jnost be flown on 3 to 5 channels with any­ reasonable prices. Each list 7Sc thing from ,049’s to .10's. If your local hobby shop doesn’t handle it. write to No. 9 OLD TIMER F/F GAS 7036 S.E. 52nd St.. Portland, OR 97206. The nacelles are fiberglass, canopies No. 9 OLD TIMER RUBBER/TOW LINE are pre-formed, the wing is foam, and No. 9 OLD TIMER FLYING SCALE A through K decals in five colors are provided. Flight No. 9 OLD TIMER FLYING SCALE L through Z Dynamics kits also feature saw-cut parts, formed landing gear, and a complete hardware pack. P.O.Box 3215 I saw a couple of prototypes of this kit Sen Jo*·, Calif. 95156 at the MACS Show. It really gets your ^ Phona (408) 292-3382 ^ tongue hanging out. I expect you better know how to fly a hot ship if you put a pair of the better .10’s on it. Similarly, I would only go down to Tee Dee .049's, and probably not throttled, just use Do you know that almost rudder, elevator, and ailerons. any modern glow engine Wouldn’t it be neat if you could make can be converted to ignit­ the guns work? See you next month. · ion R/C operation? We stock many sizes by differ­ ent manufacturers, conver­ Las Vegas .... Continued from page 33 ted to ignition and availa­ would hope that NSRCA will carry the ble for immediate delivery. ball and propose a set of rules for a We also can convert your provisional AMA event for a future favorite engine to ignition. Nationals contest." All work guaranteed to A complete run-down of the con­ meet your satisfaction. testant standings will no doubt appear in Complete line of ignition M.A.N., so we ll only list the top five in accessories stocked at all their final positions after the four-round times. flyoff: Hanno Prettner, Austria, 5061.0; Dave Brown. USA. 4721.5: Ivan Kristen­ 77 PRODUCTS 17119 S. HARVARD BLVD. GARDENA, CA 90247 sen, Canada. 4712.5: DeamKoger, USA. 4669.0; and Wolfgang Matt. Liechten­ stein. 4641.5. for your “ Flight Instructor" column in what we think is the best prop for the Yes, it was the fifth in a row for still Model Builder. Chief Galbraith. conversion: 6x4, three-blade Grish. young (26) Hanno Prettner, $15,000, Dear Chief: I appreciate your letter and Babe Bees turn this prop between 10,500 making his total winnings for 5 years a will try to cover more on this in future and 11,000 rpm, and really generate a mere $50,500! Coincidentally, the same columns, but for the time being will ton of thrust.” That jibes well with my 5 finalists fought it out in the flyoff at the refer you and others to the May ’78 concept of how to use a diesel.. . lots of contest in 1974, ending up with Prettner, Model Builder for information on take­ load, relatively low rpm, but higher- followed by Matt, Brown, Koger, and offs and landings, and to the August ’78 than-normal pitch. A 2-blade 6x5 might Kristensen. issue for help in aileron trim. The step- be worth a try, too. Hanno won with a relatively wide by-step procedure sounds good, so I'll On to the pictures! First, we have an margin this year, but it is difficult to save it for future column(s). .020 Pee Wee powered monster, the attribute this entirely to his flyingability, I'd like to thank those who wrote and "Cardcorde” . Frank Scott sent me this as his airplane was so much better suited hope others will. Send to: Dave Brown, photo. The model is primarily card­ to the type of competition than most of 8534 Huddleston. Cincinnati, OH 45236.· board, as you might suspect. The Card­ the others. Being the first major contest corde is flown free flight. Reminds me of of this type, there was considerable the “ good ole days” around 1958 to 1962 H a lf-A ...... Continued from page 65 variation in aircraft design, as compared at Sepulveda Basin. Any given morning to the current FAI style pattern ships, Keep up your good column. on the weekend, thesky would be full of which are all pretty much alike. Had any Sincerely, Bob Kress sport free flights ... all kinds, from of the other top four fliers been compet­ pseudo scale to freaky wierdos. I even Next, Bob Davis sent me one of his ing with an aircraft such as Hanno’s, the saw a gas-powered ornithopter there results might have been different . . . latest versions of a beefed-up crankshaft once . . . scale model of a seagull it was, for .049 reed-valve engines. Bob makes and we’re sure Hanno would agree with too! )etex and rubber, gliders and gas us. In our opinion, he had the contest in both Cox and Testors versions. The . . . people were there having fun. No crank has a heavier disc and stronger the bag before his first flight because of contest required . . . the main question his aircraft selection. alloy than stock, so it will stand up to was, “ will it fly?” Mine often didn't, but As Bob Upton described it, this year’s diesel loads. You may recall that my reed that somehow wasn’t a deterrent. .049 tests of the diesel conversion were pattern emphasized similarity to full very short duration. We had a Renault 4 CV and once there scale aerobatic competition, something Not only are the new cranks gutsier were four people, two 6-foot towliners which our current AMA and FAI pat­ but they add a bit of packing to the (the wings did not come apart in those terns are definitely not! These patterns crankcase and add a bit of power, too! days), 3 free flights, miscellaneous letex are mostly representative of theair show Balance is very unimportant on a diesel. and gliders, and a big fried chicken maneuvers performed by military jets. Bob says: "We have even discovered picnic lunch. Travel home was consider- This year's contest called for scale

118 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER models of full size aircraft that have actually competed in aerobatic compe­ tition, and specified minimum sizes that WESTBURG would result in larger models with more SCALE PLANS power that would hopefully fly at more • 1/24th size: 1/2" - 1 tt. No. sheets Price scale-like speed. We’ve all seen small Douglas 0-35/B-7 1 $3 25 3.25 scale models of relatively slow aircraft Douglas XO-36/XB-7 1 • 1/12th size: 1" - 1 ft. that scream through the air at ridicu­ Curtis A-8 Shrike 3 $8 25 lously high scale speeds. Curtiss Gulfhawk 1A 2 5.50 Curtiss 0-1B/A-3 Falcon 3 8 25 In spite of the aircraft specs, most of Curtiss XP/YP-23 3 8.25 Czech Avia B-534 2 5.50 the competitors, we feel, missed the Davis D-1K 2 5.50 point, and showed up with only slightly Douglas 0-25C 3 825 larger-than-pattern models that still Douglas 0-31A/0-31B 3 8.25 Douglas 0-31C/Y10*43 3 8.25 screamed through the air at non-scale, Douglas 0-38/0-38B 2 5.50 jet-like speeds. Hanno’s was one of the Douglas 0-43A 3 8.25 exceptions, and maybe by the next Douglas 0-46A 3 8 25 Fokker D-XVII 3 8.25 Price includes handling and Tournament, the message will sink in. General Western Meteor 1 3.25 first class mailing within the Actually, several contestants had tried Travel Air 2000 2 5.50 United States, Canada, and Mexico. 5.50 larger, slower flying models prior to the Waco ATO Taperwing 2 On foreign overseas orders, • 1 /10th size: 1.2" ■ 1 ft. contest, but then opted for the scale- Berllner/Joyce P-16 4 $10.50 calculate postage based on disguised pattern ships. Curtiss Hawk P-6E 4 $10.50 80 grams per sheet. Hanno’s model was of a little-known Fiat CR-32 3 8 25 No rolled prints — folded only. Great Lakes Trainer 4 10.50 (until now!) French homebuilt that had Hawker Fury Mark I 4 10.50 All prints are blackline — 30 x 42 Inches. been modified for aerobatic competi­ Hawker Taper Wing Fury 3 8.25 tion. The original Dalotel DM-165 was Hawker Persian Fury 3 8.25 Monocoupe 90A 2 5.50 actually later declared unsafe for the Sparmann P-1 2 5.50 PETER WESTBURG strain of aerobatics and had to be with­ Curtiss F9C-2 Sparrowhawk 4 10.50 834 Seventh St., No. 6 Curtiss N2C-2 Fledgling 4 10.50 Santa Monica, Calif. 90403 drawn from competition. (Perhaps they Stearman 4E , 1/12 size 2 5.50 should have allowed Hanno to redesign the structure. Shades of “ Flight of the To finish out the description, a single square loop, the slow level speed would Phoenix” !) The model was unusual in tank fed both engines with "Y" con­ ordinarily result in almost no vertical many ways. First, it was definitely the nected fuel lines, the shock-strutted speed once the nose was pulled up . . . largest entered, with a 9-1/2 foot span retracts are Hanno’s design and con­ for the average model. The Dalotel carrying 2500 sq. in., yet weighing only struction, the fuel is 3% nitro, and the simply putty-putted straight up until 21 pounds, or under 20 ounces per transmitter is Mode I. Hanno pulled it over into inverted flight, square foot loading . .. several ounces For starting, Hanno’s father, Hans, and when it nosed down, the idling less than Hanno’s Curare. would plug in external power to the prop kept the model moving at prac­ The most unusual feature of Hanno's glow plugs at a jack in the fuselage. tically the same speed . . . totally like a Dalotel was the power. As one photo Hanno then applied an electric starter to top performing full-scale aerobatic indicates (and Hanno refused gracefully the prop spinner and simultaneously machine. Adding Hanno’s piloting skill to remove the cowl until after the flipped the prop with his left hand. to the aircraft’s capabilities practically contest was over), two Webra 61’s were RPM’s would gradually increase until hypnotized everyone whenever he took mounted in opposed fashion, with a the engines began firing. The sound was off. Everyone stopped to watch . . . even third Webra case between them. Each weird, to say the least, described by the wind! The comment was made to engine turned (clockwise) a steel gear, Dave Brown as sounding like his dish­ Phil Kraft that Hanno must have had a and both of these gears meshed with a washer! To us, it vaguely resembled the computer in his transmitter. “ Hell no,” phenolic gear (2 to 1 ratio) mounted on a sound of a high speed helicopter, with retorted Phil, “ computers make mis­ third shaft (turning in ball bearings the prop turning half the speed of the takes!” mounted in the third case) which turned two engines. Several other aircraft broke up the a 20 X 11 wood prop, counterclockwise. The net result of all this was unbe­ dominence of Zlin 526’s, Zlín Z-50’s, and Exhaust residue from pick-ups on the lievably realistic flight performance. In a Spinks Akromasters, mostly powered by two tuned pipes nested in a channel on the underside of the fuselage, lubricated the two centershaft bearings. Without having to remove the cowl, NATIONAL SOARING SOCIETY Hanno could attach a shaft extension NSS No. MEMBERSHIP APPLICATION and standard prop to each engine, run DUES ARE AS FOLLOWS: and tune each in turn to a specific RPM, Nam·: Individual: $10.00 Family: $15.00 and then install the gears and flying prop (Any Senior or Open AMA member and . . . presto, synched engines! any of hit immediate family who are alto The ship carried 10 servos (Simprop AMA membert.) SSM radio); two on elevator, two on Junior: $5.00 (Any Junior AMA member) rudder, one on each aileron and one on Each member or family automatically each retract, and one on each throttle. receive! a subtcription to the society pub­ An eleventh servo, switching battery Phone: - lication S A IL P L A N E , starting with the power to the glow plugs, had been dues an removed. AMA No. LSF No. first issue published afher payment of The two balsa-covered foam wing dues and continuing thereafter through the membership year. panels (14% section) plugged into the Membershio tvoa: Dues are payable prior to December fuselage, glider fashion, using vertical 31 tt of each year for the ensuing year. flat steel joiners. The tail surfaces were Dues In the event a member joins during also foam/balsa construction. All sur­ MAIL TO: the dues year, he shall submit dues as faces were covered with Top Flite Jim Barr Donation follows: between Dec. 1 and June 30, full annual fee: between July 1 and Nov. Econocote. The fuselage (big enough to Box 2009 Total 30, one-half the annual fee Members carry a stereo hi-fi system in addition to Denver, Colorado 80201 joining during December of a year shall the Simprop!) was conventional built- New membership ( ) Renewal ( ) also be members of ensuing year. up frame and plank. FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL ΈΜ MODEL BUILDER SENT YOU! 119 Ashton. Maryland 20702. If a reasonable number of skippers show interest, a means of production will be found. This is not a project for a beginner, or for one unfamiliar with building light but strong structures. Along with the hull would probably come a set of measurements and suggestions, but you’re definitely on your own. I’m sure that there are other designs coming off building boards across the country. Why not tell me about yours? You can never tell who might want to build one of your brainchildren. I’ve been in the model yachting business almost as long as Tom Protheroe and John Reynolds. Ain’t none of us getting rich, but we’re having a lot of good times. So if you are hiding your ideas under a bushel basket because you plan HRE chassis kits are aerospace quality with aluminum to retire on the income from them, look parts anodized. They also have: ALUMINUM FRONT A X LE, out. You'd be better off to share them and reap the reward of a number of new DISC BRA KES for consistent braking, AERODYNAMIC friends and acquaintences. As I’ve said WING for lowest drag, B A LL or R O LLER BEARING many times before. I'm happiest when I CLUTCH for trouble-free operation, NYLON SPOKED can present your projects and pictures, W HEELS for appearance and life, POWER AD JUSTABLE and I always give credit where it is due. Remember that I’ll answer questions REAR END, an HRE exclusive. for a self-addressed, stamped envelope. M chassis kits for K&B 3.5cc engine have an 8mm If you are asking something general, put TITANIUM REAR A X LE ; more strength, less weight. two stamps on the envelope and I'll be Other HRE exclusives are: AIR PUMP FLYW H EELS, liable to send you MODEL BUILDER reprints from years gone past that cover FRONT and REAR ROLL SUSPENSION kits, TECH the answer in detail. Rod Carr, 7608 MEMOS. Gresham St., Springfield, VA 22151. American Model Yachting Association SEND 20d (stamps OK) FOR BROCHURE Dues are now $10.00 and should bo sent to Bob Espenshade. 7221 Casa Adobe. HRE, 18276 Foxglove Way, Irvine, California 92715 Citrus Heights. CA 95610. ·

Webra .91's with Perry pumpsand carbs. op their maximum power at lower Plug Sparks . . . Continued from page 43 Ralph Brooke flew a Quadra-powered rpm’s. Hyperbipe, Tony Bonetti would have For the second time in this issue, we Speedway engine in it. Being a race car flown a Moki-powered 1/3-scale Pitts make more than casual mention of our engine, the Speedway had a short shaft except for a last-minute practice crash former alma mater, Model Airplane intended to accommodate a recessed (borrowed a Super Fli from Kraft), Norm News, and our still great friend .. . and flywheel. To use a propeller required Cassella brought his Steen Skybolt, John teacher . .. Walt Schroder, and thank thinning the thickness of the prop so Lockwood flew a Sportmaster 150, Dean him for making our "Scale Dream’’ that the washer and nut could be Koger’s Laser 200 was quite large and come true. · applied. powered by a Master Climb belt reduc­ “ Eventually Andy tired of the model and decided to sell the entire machine. tion Webra .91, Jeff Tracy had a beautiful Sailing...... Continued from page 70 Quadra-powered Cap 20L, and Kristen­ He took it to the neighborhood model shop, “ Beans' Ice Dock” ('). and pul it sen a Webra ,91-powered Cap 10B. mean.) Last, such a configuration opens up the foredeck, and the possibility of a on display. Asking price was $10.00. At a “ What do you think about this con­ working spinnaker in this class becomes time when five cents for a tube of glue cept?” That was the big question every­ more attractive. was a hurdle, I had the temerity to one was asking everyone else .. . not As of this writing. BONE is getting a approach my Dad with the possibility of only the contest organizers, but contes­ new suit of sails with some modifications a ten dollar loan! I must have been the tants and spectators as well. Bob Upton in the jib-main ratio, and the rudder may greatest salesman in the world at that summed it up very well in his comments. be moved a bit farther aft to quicken the time, promising all sorts of things like Everyone thought it was great, and tacking action of the hull. Meanwhile, committing my services for life, if only hoped that it could somehow become her younger sister, BONE II, has been he would help to get the model. Much incorporated into the ΑΜΛ and FAI test-sailed twice and is now ready to be to my relief. Dad agreed to go for the rules. We could hardly disagree. tested against the stable you see in the deal, if and only if, Andy would accept It was obvious that next time, many pictures. BONE II is the first cat-rigged payment at a dollar a week. fliers would pay more attention to the 50/800 that I ’ve ever thought had a “ The proposition was presented to message . . . “ Make ’em fly more scale­ chance. Her early performance on the Mr. Campbell and he agreed to deliver like” . . . and the only way to accomplish runs makes one think there are rails my weekly dollar to Mr. Bean, but the that is with larger aircraft . . . maybe not under the water, and that is with the plane was to hang in the hobby shop as big as Hanno's, if transportation rudder dead amidships. I may have more until full payment was made. No words seems to be a problem (break ’em down details on her next month if the lake can describe the bitter-sweet pain and into smaller pieces!), but at least enough doesn’t freeze. anxiety of the next ten weeks. Some­ to get the wing loadings down. The The canoe bodies of BONE and BONE how. no matter how agonizingly slow. I other need is for larger, slower-revving II are essentially the same. Any reader completed the payments and the bird but higher lorqued props. This will who might be interested in obtaining a was finally transferred to my shaking come about with gears, belts, or. and hull and embarking on his own basic hands. This was my finest hour! The long here we go again, a return to long-stroke research should make contract directly walk home with my prize seemed so engines, the 'under-squares’, that devel­ with Karl Kirkman. 17500 Skyline Drive, short. Once in the seclusion of my 120 WHEN CONTACTING ADVERTISERS, TELL ΈΜ MODEL BUILDER SENT YOU! MODEL BUILDER bedroom, in my mind, that airplane flew higher, caught more thermals, and ” DAMO 4 CYCLE TWIN ' stayed up longer thän any other model ever built. The thought of actually getting to the flying site was not con­ RADIO CONTROLLED MODELS sidered. 1/12 Scale Race Cars both gas and "Purchase of the model included a electric Winners of 90% ol the tro­ package deal of transportation to the phies at the 1974 1975. 1976 & 1977 flying site and all necessary checkouts. Nationals Hand gliding was a prerequisite. Under Andy's guidance, you learned by doing. MRP 1/12 SCALE ELECTRlí It should be pointed out that the wing­ span of the Mercury was considerably 6 CELL R/C RACE CAR greater than my height. I also was k FOR MORE INFORMATION WRITE:______NP478-2^ COMPLETE LESS RADIO fighting out my class with a weight disad­ / £ ) Mason MODEL PRODUCTS f Winner of Class D 6 Cell at the) vantage. So quite naturally, my first hand l / 1354 Napervillr O' Romeovill· III 60441 312-759-19$$ 1977 ROAR Nationals and many glide was a disaster, namely, a broken V /Λ P Ο 8ο· 51BP ^ other races.______J prop. "Undaunted. Andy handed me a new This car comes complete with 05 type elec­ Now, for the piece de resistance, tric motor. 6 Nicad batteries, resistor/wiper propeller and the knife necessary to cut every modeler who enters this event and arm type motor speed control, charger, radio down the thickness of the hub. The first posts an official flight will receive a Thor mounting plate, and complete mounting and pass of the knife removed very little engine kit, value of $5.50. Now. how operating instructions wood, but it did leave a big hunk of about that? thumb hanging loose. With all the blood SAM CHAMPIONSHIPS and gore. Andy applied such first aid as This is a heckuva spot to be putting was available, then packed the plane, this year’s SAM Championships an­ tools, and me in the car and off to the nouncement, but we just received a doctor. Several stitches later and with a letter from Lin Haslam confirming the doctor bill that caused another dollar a dates of the 1979 SAM Champs, to be week drain on dear old Dad. my gas held at the Saltair Airport (Salt Lake model career was launched. City), as Tuesday, Wednesday, and "Andy Campbell went on to establish Thursday, on July 24, 25. and 26. There! Campbell’s Model Air Depot in Okla­ Don't say you weren’t told. So get those homa City. He is now retired with his vacation spots in the work schedule! We Features Include: lovely wife, Margaret, his kids, and the will follow this up in the next issue with • Rugged aluminum chassis grandchildren. He has given up model­ all the information that is available. • Adjustable Independent front suspension ing, but awhile back he surprised me IDENTIFIED! • Painted and trimmed Cobra II Lexan* with a package. In it was a yard of black- Quite some time ago we ran a picture body—light, strong, sharp looking, and and-white checkerboard silk he had of the old Reading (Pennsylvania) gang good handling. found in one of his disused drawers. • Brass bushed front wheels with only a partial identification of the • Insulated quick charge G.E. batteries "I think I owe it to Andy (and the Old members. In a letter from Bob Gable • Long wearing molded front and sponge Timer movement) to build a Scientific (one of the few remaining), identifica­ rear tires Mercury complete with the checker­ tion of the September 1977 Plug Sparks • Heavy duty rear axles and gear board silk covering. This time, I’ll use a lead picture is: • Charger connects to any 12VV battery and Brown )r. engine because Andy taught Back row: John Michles, Bob Gable, charges in 15 minutes me to avoid carving propellers. One big • Radio mounting plate adapts to all 2 chan­ Rev Lindecker. Al Smy, Franklin Gill, nel radios scar is all I need on my left thumb!” Wolfinger. Mel Haines. Bob Long, "SLAG” ENGINE EVENT Unknown. For those who don’t know what “ slag” Front row: Unknown, Jack Haggerty, engines are. these are motors which Jim Kroener, Ed Marks. David Petree, have aluminum cylinders and pistons as Charles Roth, Unknown. mating surfaces. Engines that fall in that True, several fellows remain un­ category are the Genie. Thor, Rogers, known, but this is probably the best Synero B30, ]udco. Ram, Buzz,and other identification of the Reading gang that cheapies. can be found. Mark Fechner, who has been produc­ ing Thor engine kits for $5.50, has TEXAS TALES proven time and time again that these Received a most interesting sheet engines will run,and pretty darn goodat from Helmer Johnson (SAM 29), where Basic Specifications: that. they have actually taken a poll of what Speed: 30 MPH 50 KPH the average flier likes in Old Timer R/C Gear: 16T Brass 52T Molded Fechner is offering a prize (or trophy) activity. Here's what they think should Rear Tires: 2 V D x 1%' wide for the best flying model that employs a be installed: Wheel Base: 7V4‘ Width: 6%‘ slag engine for power. This trophy will 1) Best three out of five flights. The 6 CELL ELECTRIC R/C CAR LESS RADIO COMPLETE AS LISTED «928—$120.00 be given at the 1979 SAM Champion­ highest and lowest do not count. ships at Salt Lake City. ALSO AVAILABLE READY TO RUN WITH 2) Engine run: 30 seconds both classes. ELECTRONIC SPEED CONTROL A COM­ Rules are rather simple, based on the 3) Spot landing: None, but model PLETE JOMAC RADIO SYSTEM «910 present SAM Rule Book. The only addi­ should land in designated area. tions to the present rules for this special 4) Flight time: 10 minutes maximum, Five gas and three electric to choose event are as follows: after engine cutoff. Must land within from with or without radio Send 50* for 1) Any original type slag engine origi­ three minutes thereafter. complete catalog to: nating in 1950 or before may be used for 5) Trophies should be first through power. fifth. 2) Reproduction engines (of the origi­ Other suggestions brought out (but not nals) are acceptable as long as original acted on) in the Texas survey include: 12702 NE 124th Street type parts are used. This also includes 1) Flights to be flown in rounds. Kirkland. Washington 98033 original type metals. (Nosubstitutionsof 2) Antique and Old Timers fly sepa­ (206) 827-8606 steel for aluminum.) rately. FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL ‘EM MODEL BUILDER SENT YOU! 121 Jim Persson, AMPS Contest Director and reporter, sez the weather was quite variable, and this posed a problem for the “ sandbaggers” who love to wait out the weather. As it turned out, those who The Pipeline flew and hoped for the best were the specialising in filling the nee winners. Probably the best event of the day was P.O. BOX 1868, FREMONT, CA 94538 Class C, as the old master, Sal Taibi, showed the way to go with his Forster A Complete Line of Boats, Hardware .99-powered Anderson Pylon. (We un­ & Accessories from the Leading derstand Sal Taibi has already cut wood for eight other Anderson models for Manufacturers various members.) Bob McBride and his son, Ken, provided most of thecompeti- Also, Custom 1/12 tion with Sailplanes. Having maxed Scale Electric once, Bob damaged his Sailplane and Car Parts. had to retire for repairs. In the mean­ CATALOGUE $1.00 time, Kenny put his model up for a creditable total of 8:14. Back came Dad McBride with repaired Sailplane, got the motor screaming, and turned her loose. A. J. FISHER INC. CUSTOM TUNED ENGINES The wing let go at 200 feet and a spec­ manufacturers of quality AND COMPETITION tacular crash ensued. Scale brass ship and Yacht Just about quitting time (as usual), Fittings Since I92S ACCESSORIES Larry Boyer showed up to put in his last Plans - Fittings - Kits - Books Specialists in standard flight. Wouldn’t you know it, he scores ILLUSTRATED CATALOG, $1.50 with a total of 8:15!! We are going to or throttled Cox .049/.051 start putting a handicap on this boy for and Rossi .15 engines, every minute after 2:30 p.m. that he parts & quality racing products. enters. For detailed information, Results show Larry Clark winning send 15 c stamp to: Class A Ignition; Tom Keppler, Class B Ignition; Sal Taibi, Class C Ignition; and Kustom Kraftsmanship Larry Boyer taking 30 Second Antique. On the off-beat events, Lee Shroeder P.O. Box 2699 won O/T Rubber and Don Wrench Laguna Hills, CA 92653 grabbed off honors in .020 Replica. Larry Boyer won sweepstakes, taking Z I P - 4 8 0 6 7 (714) 830-5162 third in Rubber, second in Class A, second in Class C, along with his first in 3) One pilot per plane. STOCKTON ORIGINAL OLD TIMER Antique. Everyone went home with a 4) Throttle to be advanced to high Seems like we just wrote a column on prize. Great meet! five seconds after cutoff (insures motor this the other day, but here it is already, MECA COLLECTOGETHER is truly dead). the 18th Annual. Incredible how the Normally, this columnist doesn’t write 5) If ignition powered planes start time goes by! up the various Model Engine Collectors Association (MECA) swap sessions, showing up, separate events and tro­ The AMPS Club (SAM 32) has been called “ Collectogethers” , however, the phies should be provided. primarily responsible for running and District 2 Fall get-together was about the The interesting thing about the fore­ continuing this grand old contest. In the finest one this writer has been to in going is that much of this is already in past few years (due to a tremendous O/T years. use on the West Coast. With five O/T contest calendar), the Stockton Annual R/C SAM Chapters, there is much more has had to be run in conjunction with Due credit should be given to Dick activity and competition. Of course, the the Fresno GMA Annual. As it has Dwyer and Bob McBride for organizing foregoing helps refine rules that much turned out, this has given the old annual a dandy meeting at the Rogers Jr. High more quickly and brings home the a shot in the arm, and good attendance School on Doyle Rd., in San Jose, on deficiencies of the present SAM rules. has been the result thereafter. October 21. Most fellows sort of resent the $1.00 fee, but fail to realize they can eat that much in just coffee and dough­ NATIONAL SOCIETY OF RADIO CONTROL AEROBATICS nuts. In addition, the free lunch put on by the ladies, Mrs. Brodsky and Dwyer, NEW MEMBERSHIP AND RENEWAL FORM Pitas· PRINT was again a goodie. Hard to keep that weight down! Nam#______AMA No______Of course, the fun begins when Bill Daniels from Long Beach starts the auction. This man can get the fish hooks Addratt ______out of the pockets of the tightest collec­ tor. You gotta watch out when he sez, C it y ------Stat· ______Zip ------" I’m gonna sell it.” He generally does! What with all the door prizes, trophies Competition Classification: A Π B CD C/DN CD C/OE CD for best engine display, and awards for best engine restoration, make plans to NEW CD RENEWAL □ NSRCA No______attend next year’s shindig. Well worth the time! Dues are $10.00 tor one year. FLORIDA FLASHES Sand check or Money Order to: Terry Rimert, of the North East Florida NSRCA, c/o Sally Brown. 8534 Huddleston Driva, Cincinnati, Ohio 45236 flying Model Council, reports that the Jim Kloth Memorial and "Gathering of

122 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER Turkeys" meet came off real good. This meet is always great, according to Terry, as it enjoys the best field east of the Mississippi, great weather, and best of all, no tension. This makes for a relaxed, enjoyable flying lime, with plenty of P&W partial kits for prizes. The Jim Kloth Old Timers Memorial enjoyed great attendance this year due mostly to good publicity and even better weather. As Terry calls him, “ Old Lucky” Jim McNeill was getting picked on by everyone. He lucked out in O/T Cabin, RUDDER as Bryton Barron’s timer only ran 17 ASSEMBLY seconds instead of 25. When they get MOTOR Aluminum die cast. „ that close, ya gotta have something else MOUNT Available for both than luck going for you! However, SET Die cast aluminum, complete with 5" .40 and .60 boats. Easy to assemble. Barron had no apologies to make, as he Master Mount, Screws and Washers, and In­ won O/T Pylon very handily. Comes complete with Mounting sert Adapter for .40 or .60 engine. Inserts Plate and Screws, Pivot Bracket, Terry further reports his McCoy did it can be rail mounted in boats with confined Rudder Blade, Pivot Pin - with again, starting on the first flip after a year engine placement areas. Nylon Bushings, and Water Pick­ of non-use. However, the Playboy again up — threaded and adjustable. did it again, the biggest loop you would The .40 and .60 Rudder are iden­ ever want to see. Terry also succeeded in tical, except the .60 Rudder Blade blowing the O/T Flying Scale event to is W longer. M cN eill by leaving his model in a DOUBLE RUDDER OUTDRIVE ASSEMBLY For .40 convenient place for the wind to de­ or .60 boats. Aluminum die cast. Complete with stroy. By this time. Rimert was out of his Master Bracket (designed with twin ribs for indi­ mind as he lost the event by only 9 vidual modification), 2 Rudder Pivot Brackets, 2 Retainer Plates and all necessary Mounting Screws points, and with one full flight left! To and Washers. Also includes Adjustable Strut - with really rub things in, McNeill then won installed Olite Bushings, Pivot Pins - with Nylon the Ó/T Rubber event. Some days it just Bushings, 3 Control Arms — with set screws and 2 don’t pay to get up! Rudder Blades (2 ARB for .40, 3 ARB for .60). SAM 7 YANKEE The SINGLC RUDDER OUTDRIVE ASSEMBLY is the same as the above, except it only includes 1 Rudder Blade, Rud­ Been cjuite awhile since we heard der Pivot Bracket, Pivot Pin and Control Arm. from the Connecticut boys, but they are still active as ever, successfully staging FLEX CABLE the East Coast Old Timer Champion­ DRIVE LINE AND COMPONENTS ships. Of particular interest in reviewing TEFLON BUSHINGS & WASHERS the results is the division of the .020 Replica event into two classes,cabin and 3 bottom of our vri eor 3 pylon. This was tried originally by the a o ΠΑ SCIFS, but failed because of lack of STUB SHAFTS FLEX CABLE AND STUB SHAFT ASSEMBLIES SHAFT LOG 2 V i" 3 V i" entries. It appears the SAM 7 boys may ILNXW nidlihlllNuniniinilllllUliimiimlluumntuulll FERRULES Z 3 have found the event to suit them and their small fields. □Bantu Other events normally not seen at H standard Old Timer meets were O/T Towline, O/T Outdoor Hand Launched rpilllinillllT IINIIIIIIIIIIIIIIII C Glider, and Rubber Scale/Peanut Scale Other Model Boating Hardware includes: Rudder Blades, Pivot Pins, Strut and Tee Bracket Assemblies. combined. Interestingly enough, this Struts, Stub Shafts, Olite Bushings, Solid Shafting, Flywheel Nut & Cable Adapter Assemblies, Tuned club divides the engine displacements Pipe Couplers, Clamping Water Pick-ups, Skegs, Control Arms, Drive Dogs. Folding Scissors, etc. much like the original O/T Stockton For complete details K&B meet held in the early sixties; i.e.. Class I send $1.00 for K&B up to 0.25 cu. in. and Class II over .25 cu. Marine Specialties MANUFACTURING Model Boating DIVISION OF AURORA PRODUCTS CORP in. This was only done for the cabin 12152 WOODRUFF AYE., DOWNEY, CA. 90241 models; the pylon categories were Hardware Catalog merged into one event. Guess we know what is the most popular around that The Willamette Club proved Mur­ area: realistic flying cabin models! Botticello, Yankee Editor, says there were enough animals to put Old Mac­ phy’s Law again, as they had no sooner The Brown Engine Powered Event Donald's Farm to shame. That’s what it is postponed the meet at 10 o’clock, than (similar to Bud McNorgan’s Brown Jr. all about . . . FUN! the weather got beautiful by twelve. “ If Only Event) failed to draw much sup­ NORTHWEST O/T CHAMPS it can happen, it will” . This did reduce port, as only three contestants registered Here is a meet that has been annually the number of contestants for the official flights. For a change. Henry sponsored by the Willamette Modelers following week, but the excellent Struck was on the bottom! for over ten years. Despite the lack of old weather and good site made for an In all, thirteen free flight events were time modelers in that area, this contest enjoyable time for all. staged, making this the biggest meet on draws well compared to other N.W. Of the ten events put on, after review­ the East Coast (excluding the SAM contests. ing the results, the overall winner would Champs, of course). Full credit for The collectogether held on Saturday have to be Don Sobala, as he won the making the meet the success it was, night has gotten to be a regular feature Antique event, claimed the .020 Replica should go to the excellent weather and and is looked forward to with quite first, third in Class A/B,and won Ignition to the wives who took over the dining some enthusiasm by the contestants. Of Cabin. Not a bad day’s work! Don did facilities. Things were so well organized course, with the Stalicks hosting the cause a stir when he entered a Rambler that they even had a nursery for the affair at the Tangent Community Hall, in the cabin event. Much to this writer's younger O/T generation, liberally the collecto couldn’t help but be a surprise, it was allowed to enter even stocked with stuffed animals. Carmen success. though windows, not shown on the

FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL ‘EM MODEL BUILDER SENT YOU! 123 1977 INDY UNLIMITED: WIN WITH THE WINNING COMBINATION 1st, 3rd, 6th, & 8th OF FIRST 10 OCTURA WING-DING PLUS OCTURA PROPS & HARDWARE OUT OF 124 ENTRIES (Overall winner 4th year in a row) 1977 IMPBA ANNUAL REGATTA: 1st in Class E Straightaway 1st in Class F 1/3 Mile Oval 1st in Class E 1/3 Mile Oval 1st in Class E Multi 1st in Class F Multi 1977 NAMBA NATIONALS: All but one of the winners used Octura Props, most all used Octura Struts, Rudders, Etc. M ulti: 1st in Class X 2nd in Class X 1st in Class B 2nd in Class B s e n d 50< f o h c a t a l o g a n d p r i c e l i s t 2nd in Class A 7351 N. Hamlin Ave. Plus! New NAMBA Oval Record OCTURA MODELS INC. Skokie, III. 60076 of 1 min., 13.4 sec.

flight won.) Ehling stationed himself in a position to watch all of Bassett’s prepara­ tions. Finally, Bassett had his model all put together and started test gliding his Miss Philadelphia (which version, he doesn't recall). After several launches the model seemed to glide pretty good, according to Ehling’s standards. Not so by Maxwell. He continued to glide the model, shim­ ming up the tail until the glide was actually poor. Rats! thought Ehling. This guy may know how to run a Brown Jr. and get the most out of it, but he sure W-1 ... $59.00 W-2 ... $119.00 don’t know beans about adjusting a • Custom R/C design for all boat sizes · Power · 40 in. lbs. »Travel model. So he left Bassett to his hand time · 5 seconds »Voltage - 4.8-6 (W-1) »Size -2x2x5 inches. gliding techniques. Of course. Frank entered his good­ The Probar W-1 is mechanically operated by a separate, neutralizing flying model, cranked it up, and let her servo. The Probar Propo W-2 is designed to plug directly into the receiver, go. The model climbed into the blue and requires no extra batteries. Specify Kraft, Futaba, or no connector. until it was a wee speck. The motor quit Both winches are fully assembled and tested, ready to install. A ll mounting and a nice glide started. After eighteen hardware, switch pushrod (W-1 only), and winch arm blank are supplied. minutes, the model drifted out of sight. STAINLESS STEEL HARDWARE: MISCELLANEOUS ITEMS: It was only after Frank had retrieved the Turnbuckles, Chainplates, Goosenecks, Sheet exit guides, 3owsie, model that he began to carefully look Boom vang pivots. Pad eyes, Tangs, Rudder posts. Mast head around at the rest of the competition. Deck cleats. Boom cleats. Rigging wire, fitting. Dacron sheet line. As was expected, most models that Dealer inquiries invited were well adjusted were flying some­ PROBAR DESIGN P.O. BOX 639 ESCONDIDO, CA. 92025 what like Ehling’s model; steep climb into the blue, nice glide, and flights anywhere from 15 minutesto18minutes. plan, were painted on!! The boys are being offered by P&W Products and going to have to read the SAM rules a Schmidt Custom Kits. As Bassett made ready to fly, Frank again little bit more closely. If it don’t have a Although Bill didn’t indicate whether focused his attention on him. cabin configuration and windows as per he is producing a partial kit similar to the As usual, Bassett had his Brown run­ real aircraft, it ain’t a cabin. other companies, it appears he may be ning excellently, and with his incompar­ able flair for obtaining maximum econ­ Also noted among the winners was producing the whole wood stock neces­ sary to build the model. All kits will be omy from his engine, a very long power Don Dodd with his venerable New flight resulted. As the glide started, Ruler. He has had that model a few complete with plans and instructions. LaRue is presently in the throes of Ehling suddenly realized Bassett’s model years! He also came in second in the was gliding rather steeply, compared to Time Target Event, being off only 19 putting a catalog together, so, if inter­ ested in Old Timer kits, drop Bill a line. the other models enjoying optimum seconds. Probably the biggest surprise gliding angles. was to find John Lenderman in second THE WRAP-UP As Frank said, I now understood why place behind gas flier Dick Williamson in Anecdotes are always an excellent Bassett had adjusted the model so where the Rubber Stick event. Dick also won way to close out a column, and one on all the other models were gliding excel­ Rubber Cabin!! Shades of a new rubber Maxwell Bassett, as told by Frank Ehling, lently and drifting from sight, Bassett’s peril coming up? (Latest dope is that seems to be in order. model with its steep glide stayed in sight Lenderman was busy winning the In the early days, Maxwell Bassett won and actually landed on the field five Coupe and Unlimited events at the so many times it was almost automaticto minutes ahead of the nearest concurrent Silents Please Contest.) award him first place when he e’ntered. competition! Next year, hopefully, there won't be Frank Ehling decided Bassett couldn't be Ehling said he learned to appreciate two meets on the same day, although that good and planned on watching his Bassett’s techniques. Maybe Bassett you can’t complain about nothing to fly! technique at the next contest. wasn’t the greatest builder in the world REPLI-KIT Sure enough, the next meet was a and his stuff didn’t fly that great, but with lust received a short letter from Bill lovely day. with gas models climbing his engine running technique, plus just LaRue, P.O. Box 374. Inverness, Florida into the blue and registering nice flights plain good, common sense, Bassett was 32650, wherein he announces a custom (columnist note: this was a Texaco type invariably the winner. Bassett proved it service for cutting wood for Old Timer event where you were allotted so much over and over again: “ The race is not kits. This is somewhat similar to what is fuel per weight of model. The longest always to the swift.’’ · 124 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER Counter...... Continued from page 9 pounds of thrust, with a transit time of .3 CARR SAILS second and a weight of 2 ounces. Just the thing for the biggies, and for cars and boats or any application where more 7608 GRESHAM ST. than average muscle is required. Now available, at $49.95. SPRINGFIELD, VA. 22151 Inquiries to Logictrol International STANDARD ON ALL CARR SAILS Corp., 3300 Stovall St.. Irving TX 75061. F in ·« American-mad· DACRON seldom Vinyl, press-on numerals and insignia Heal sealed edges eliminate fraying Coated, stainless steel jibstay installed My friends who compete in scale Roiled-edge grommets in tack, dew 8 head events tell me that it is getting harder Bolt-rope mens'! luff matt attachment Santa Samara $30 00 10-Rater $30 00 and harder to get high flight points, and Eaat Coast i2 M«t*< $30 00 50/800 (M-clasa) $30 00 that they keep looking for new and 36/600 $25 00 Internal A-dass $35 00 W#st Coast 12-M il« $30 00 Star 45 $30 00 different ways to impress the judges. Vanguard J ' boat $40 00 TAA Patra! $30 00 Dropping things seems to be a way. We Scale vessels, special purpose boats, one-of-a-kmds Wnte for a quote, and tor our know of one guy who dropped his 1978 Brochure and Used Sets Ust engine on a high-speed pass, which might have gained him points for that maneuver, but he lost a lot of them on his approach and landing. VINTAOS R-C PURS Maybe dropping bombs is a better J e B o ä way, if yours is a warplane. To enable you to do so realistically and reliably, i s Vortac Mfg. Co. has available both a bomb or tank drop mechanism and a d ' N u t s ! ” fall-apart bomb that you can fill with PIPER J-3 CUB-1/4 SCALE flour to make a realistic burst upon 9 FT. Wing S p a n — o iiio m io tv - «.c . i w i i t i i · I l l »/C SALtS CC-TU (IDEAL FOR'QUADRA CAS ENGINE) p rlc ·· •n)n»*'*r*l u n uiN icon ιοι «u«»u im m i I jr«r fin ««rate«· impact. l»re'4ltleit»< ι ; · 1 » · · ι Both items are precision molded from P la n s : $ 1 3 .9 5 PLANS-AOO $ 1.50 POSTAGE >u hasp «/c stumt CP?» a light plastic to which paint, if neces­ 3 SHEETS 36“X72* !«p*rt*f!ř·'· 'p*e talia tit CrMt. Here, frollM . Pldstlc Cowl: $ 8.75 $ ·λο postage E-« ·ηβ llreft sary, should readily adhere. The mount fc* nour tu rre re v ra * is a two-piece device, the base of which Edo floot plons: S 4 .0 0 $ 1.00 postage for liře A prie·* contact χ·ι FLOATS-4 7 "LONG is permanently attached to the model. . . . . D EALERS WORLD WIDE Ι»7β CATALOG 50{ UfAUTCn A second piece, which is attached to OVER 50 PLANS ffAfl I LB drRDI T " * g O C°WTWO<· whatever you wish to drop, is then SID MORGAN PHONE ne-t]}4«23 49 COLOEN CT. BUFFALO. N Y 14225 inserted into the base, where it is held J3t^^nnondi^ellevilJ^^!icl^e 4811^ securely until a servo-operated release is operated. House of Balsa's P-51. The Vortac bombs are equipped with The Bomb and Tank Drop mechanisms A new basic scale unlimited hydro has the same type of latching as the drop­ are priced at $4.98; with extra releasable just put in an appearance. It is a fiber­ pable piece, and can thus be inserted clips at 2 for 98«. The bombs are $5.98 glass .60-size boat that is legal for both directly into the base. The bombs are each, or $9.98 for a package of two. NAMBA and IMPBA (Why TWO organi­ 1-1/2 inches in diameter by 5-7/8 inches Available at your dealer. From Vortac zations????) events. It can be completed long, including the fins. This makes them Mfg. Co., P.O. Box 469, Oak Lawn, into such boats as the Miss Budweiser, the equal of a 500-pounder to Top Flite IL 60453. Pay’n Pak, Atlas Van Lines, Circus- Models’ warbirds, or a 1000-pounder to Circus, and many others. The kit comes complete and assem­ bled, with the cowl of your choice. It requires only the installation of the hardware, a radio, and painting, and it is then ready to run. The kit is priced at $200, and is avail­ able from Stewart Scale Models, Rt. 2, Box 220-5, Thonotosassa, FL 33592.

Mention carving to most non-model­ ers and their thoughts will immediately turn to Cepetto tediously hacking on Pinochio’s nose. Not always so .. . as any model builder will tell you, because very often that type of skill is quite useful during construction of model planes and boats also. The skills you’ll have to develop yourself, and remembering that they will only be as good as your tools, we’d like to introduce you to those available from Harmen Company, Inc., 34 Park­ way, Little Falls, N] 07424. Made as a set, of high-carbon tool steel, these tools are claimed to be the smallest of this type in production, and especially suitable for miniature and

FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL ‘EM MODEL BUILDER SENT YOU! 125 \ "PRAIRIE BIRD* FLY ti in. Winfs/mn ELSTRfC Hit $3.95 o VL-101 Electric propulsion system shown— using Hytork 48 motor and planetary gear box, SJ-3 switch & charging jack, and B-33L fast charge ni cad flight battery— total weight 2Y2 oz.— will power models 25 to 50" wingspan weighing up to 10 oz. New! from the *PEANUT PEOPLE" Send 50c for latest catalog showing V L PRODUCTS NEW "79" CATALOG $1.00 full line equipment & accessories. Division of Vista Labs COMPLETE GUIDE OF RUBBER MODEL SUPPLIES Hobby dealers send for information. 7023-D Canoga Avenue Canoga Park, California 91303 Ptck-Ptfymtrs P. O BOX 2498 -MB LA MESA. CAIIF 92041 PHONE (714 469.8675 « (714) 442-4636______open-gimbal transmitter is now listed, available in both 5 and 8-channel mod­ els, and with either two or single sticks. YES-SIR, YES-SIR, THREE BAGS FULL I When you write to ask for your cata­ log, mention that you read about it in Model Builder. ·

It was at this point that the Executive & Council agreed to the founding of Model Aviation, though again, we don't WALT MOONEY NOW OFFERS 3 BAGS OF PEANUT SCALE PLANS know exactly who originated the idea. ALL WELL TESTED DESIGNS, AT ONLY Í5.00 EACH Quite obviously though, those of us who are in the model publishing business as EACH BAG FEATURES FOURTEEN PEANUT PLANS, private enterprises do not condone this ONE O TH ER, P LU S PHOTOS AND INFORMATION decision. It has literally put us in compe­ SEND tl.00 FOR COMPLETE LISTING AND SAMPLE PLAN TO: tition with the national organization that WALT M OONEY, 2912 CA BR ILLO MESA DR represents the hobby we support and publicize. SAN DIEGO, CALIFORNIA -92123 INTERNATIONAL NOTES CANADA: From the “ Glib Glitches” detail work. Two tools have 5/64-inch Designated as the ID-4001, and priced newsletter of the Radio Control Flying blades: the other four have 5/32-inch at $369.95 as a kit,or $595 assembled, this Club of British Columbia, edited by blades. The set is available with either modern device tells you the date and jamie Gielens, we learn that Canadian half-round palm-style handles, as time, temperature outdoors and indoors R/C modelers now have government shown, or straight handles, all in hard­ (both Fahrenheit and Celsius), baro­ approval for 4 new frequencies on the 72 wood. Either set is $16, and may be metric pressure in inches or millibars, MHz band; 72.720, 72.760, 72.800 and ordered direct. Tell them MB sent you. and whether it isrisingorfalling.and the 72.840. * * * wind direction and speed in miles, knots, and kilometers per hour. From the same source, two more For the modeler who has everything, items. In order to save MAAC (that's or whoever needs better weather infor­ Complete information is included in Canada’s AMA) approximately $20,000, mation than that obtained from looking the latest Heath catalog, available upon the Board of Directors has elected to cut at the sky and sticking a wet finger in the request from Heath Co., Benton Harbor, the MAC newsletters from 10 to 4 issues air, we recommend you take a close look Ml 49022. per year. Main reason for the cut is the at Heath's first computerized weather This catalog also lists many electronic saving to MAAC, thus avoiding a dues station. kits of interest to everybody. A new R/C increase which otherwise seems likely (Ahem!). Also, Ron Shettler, our” Mam- PIERCE AERO COMPANY PRESENTS THE . . . moth Scale” columnist, has become chairman of an MAAC committee to establish and set standards and limita­ tions for all types of model aircraft. R idge R at WHAT'S A MODEL? We’re still concerned that AMA is 49" SPAN SLOPE SAILPLANE dragging its feet in making a firm defini­ tion of what’s a model airplane. We must Semi-symmetrical wing that can be have a guideline for our insurance built flat on your workbench. 1/8 companies and the FAA, so that respon­ light ply fuselage sides. Sheet balsa tail. All machined parts . . . no die­ sibilities can be properly established in cutting. All hardware. Full size plans. the event of a serious accident. See more Detailed building and flying instruct­ on this matter in our ” R/C World” ions, with building photos. column. THAT’S ONE! AILERON AND ELEVATOR CONTROL, MANEUVERABLE BUT EASY TO FLY. Our sincere congratulations to Cap­ PARAGON, 118" Span, NEW PRICE, S69.95 Dealer & Distributor inquiries invited. tain Mike Moritko, USAF, Riverside, California: and by offering such, our PIERCE AERO CO., 9626 Jellico Ave., Northridge, CA 91325 (213) 349-4758 equally sincere castigations to all other

126 WHEN CONTACTING ADVERTISERS, TELL ΈΜ MODEL BUILDER SENT YOU! MODEL BUILDER CLASSIFIED ADS Non-commercial (personal items) Rate is 25 cents per word, with a minimum oi $3 00 ADVERTISERS INDEX Commercial Rate is 40 cents per word, with a minimum of $5 00 No mail-order discount house ads knowingly accepted No advertising agency discounts allowed Ace R/C. Inc...... 111 All ads are payable with order, and may be lor any consecutive insertion period specked Aircraft Model Products ...... 110 Name and address tree, phone number counts as two words Send ad and payment to Applied Design Corp...... 110 MODEL BUILDER Magazine. Classified Ads. 621 West 19th St .Costa Mesa CA 92627 Astro Flight, Inc...... 92, 93 Barron's Scale Classics...... 111 Bavarian Precision Products...... 103 Canadian Model Exporters...... 111 COMPLETE KITS from Model Builder plans. Model Builder Collection Mint. No. 1 to Dec. John Pond, Sid Morgan. Catalog $1.00. 77 Air Trails Annuals, Aviation Mags Carr Sails...... 125 Repli-Kit, P.0 Box 374, Inverness. FL S.A.S.E. for list Ira Keeler. 572 Deodara St., Classic Era Model Plans...... 113 32650. Vacaville, CA 95688. Cloudbuster Venture ...... 113 Coverite ...... 3 Jim Crocket Replicas...... 114 .020 REPLICA KITS: PLAYBOY SR., STRA- Davis Diesel Development...... 105 MODEL MOTORS, new and used Also ac­ TO—STREAK, BROOKLYN DODGER, SO- cessories. ignition items, kits. List 25C. deBolt Radio Control...... 125 LONG FREE PRICE LIST J & R MODELS. Du-Bro Products, Inc...... 99 T. Crouss, 100 Smyrna, W Springfield, MA 5021 W. Sheridan St.. Phoenix, A2 85035 01089. Eastcraft Specialty Products...... 110 Empire Models...... 116. 117 WANTED: Old-Time spark-ignition model Electric Championships ...... 98 WANTED: Old model airplane engines and airplane motors, magazines and gas powered FAI Model Supply...... 114 miniature gas powered race cars and all race cars of the 1930's and 1940's Russell A.J. Fisher, Inc...... 122 related items from 1935-55. Arthur G. Suhr, Stokes, Rt 1, Box 73J. Keller. TX 76248 W218 N5866 Maclynn Ct„ Menomonee Flying Scale Models...... 108 Falls. Wl 53051 Flyline Models ...... 113 FF/UC SCALE PLANS Peanuts, Walnuts, Fox Manufacturing Co...... 97 Hazelnuts. Rubber, CO2 , Gas. Modernis­ Futaba Industries, U S A ...... Cover 3 HOBBY HORN, hobby specialties: Old tic Models P.O. Box 6974, Albuquerque, NM Hobby Hideaway...... 115 Timers, Electric power, Y & O Props. Big 87197. HRE, Inc...... 120 Red Rubber Bands. Plans Scaling, Acces­ International Modeler Show...... 90 sories. Bob Sliff. Send name/address for Jomac Products, Inc...... 121 free catalogue to Hobby Horn, P O. Box Collection of over 50 F/F kits, some en­ J & 2 Products...... 96 3004, Seal Beach, CA 90740, (714) gines. SASE for sale list. F.X. Ryan, Depot Hill Rd . Amenia, NY 12501. K & B Mfg. Co...... 91,123 894-6223. Kraft Systems. Inc...... 1, 103 Kustom Kraftsmanship ...... 122 Majestic Models...... 115 Jim Messer's Quality MOVING? SEND NOTIFICATION FIRST) Model Products...... 107 Micro-X Models...... 112 Attach old label here v _ Attach old label here 1 Midwest Model Supply ...... 121 N A M E \ 1 Midwest Products Co...... 107 OLD Model Builder Binders...... 112 ADDRESS ADDRESS Model Builder T-shirts...... 101 Model Rectifier Corp. (MRC).. Cover 8 (PI··*· Print) CITY J S T A T E Z IP 1 Walt Mooney Peanuts ...... 126 1 Sid Morgan Vintage Plans ...... 125 |_ Attach old label here f Attach old label her· Octura Models...... 124 Orline, Inc...... Cover 4 NAME NEW Pacer Technology & Resources . . . 106 ADDRESS PanaVise Products. Inc...... 94 ADDRESS Parcel Post Proxy (PI··*· Print) Peanut Contest ...... Cover 5 CITY STATE ZIP Peck Polymers...... 126 Change of address notices must be received one month before date of issue that new Pierce Aero Co...... 126 address takes effect. For prompt tarvic·. old tab·! MUST b· attached. Post offic· will The Pipeline ...... 122 not forward copies unless you pay extra postage. Duplicate inun cannot b« sent. John Pond O.T. Plans Se rvice ----118 Probar Design ...... 124 MODEL BUILDER, 621 West Nineteenth St., Cotta Meta, Ca. 92627 Proctor Enterprises...... 106 Proline Electronics, Inc...... 95 Quarter Headquarters ...... 105 District X radio control modelers, espe- relatives, non-modeling friends and Radio Control Buyer's Guide...... 100 cially those who are competition business associates would all listen, Rhom Products Mfg. Corp...... 109 oriented! glassy-eyed, smile politely, and walk Satellite C ity ...... 114 Mike is the only AMA member in the away shaking their heads. Schluter Products...... 102 whole district, covering California, "However, such classical hobbies as R. Shettler Enterprises...... 105 Nevada, Utah, Arizona, and Hawaii, to golf, hunting, fishing, tennis, etc. always Sig Manufacturing Co...... Cover 6 send us opinions on the 84 R/C rules Sterling Models, Inc...... 2 seem comprehensible to non-partici­ Top Flite Models, Inc...... Cover 2 proposals for the 1980-1981 period. Sure pants. Even such violent pastimes as Uber Skiver Knives...... Cover 7 glad you trust us so completely to do the motocross, skydiving, and scrambling VL Products ...... 126 right thing, and that you are going to be up mountains are OK to be ‘into.’ Peter Westburg ...... 119 happy with the new rules, whatever the "But playing with toy airplanes still Williams Bros.. Inc...... 115 outcome. You will be happy . . . won’t remains a lunatic fringe set aside for WRAMS Show ...... 104 you? small boys and weak-minded adults. 77 Products...... 118 THE SUNSHINE BOYS And, if you’rean OTer with 30or40years The above title leads off another of involvement, you are beyond all help. sharply penned editorial by Ken Sýkora, "Which is all right. Any individual or editor of the SCIFS (Southern California group with a consuming hobby outside MODELS* Ignition Flyers) "Flightplug" newsletter. the mundane mainstream of working, eating and sleeping is considered a bit BUILDER “ Long ago we stopped trying to nuts by life’s ‘spectator’ contingent. explain to the 'civilians’ our life-long "But the thing that’s confused us for fascination with model airplanes. Family, some time now is that there are those

FEBRUARY 1979 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 127 FULL SIZE PLANS SERVICE No. 10782 AFTERNOON D ELIT E $3.00 No. 6782 PASKEY $4.00 Compact 54" span, highly maneuverable Low-wing, trike, sport/pattern for advan­ Including reprint of construction article V-tail R/C slope soarer. Randy Wrisley. ced flier, 42" span, .19. Randy Randolph. (if any) No. 10783 ΑΤΑVI ST $3.00 No. 6783 R/C SAILING KETCH $10.00 Quickly built, highly competitive, half-A Complete plans (4 sheets) for building an No. 2791 GROSS VO GEL II S7.00 free flight, 252 sq. in. Bill Langenberg. elect, aux. powered ketch. WaltMusciano. Large (1700 sq. in.) plank-type R/C fly­ ing wing, .19 to .60 eng. Charles Clemans. No. 1078-0.T. TLUSH'-S INSPRER S4.50 No. 6784 BUSY B $1.50 Modern construction featured in this '37 Very thorough instructions go with plans No. 2792 CLIFFH AN GER $2.50 cabin ship, 78" span. By Francis Tlush. for this competitive EZ-B. Ron Roberti. R/C slope soarer quickly built from Ace foam wings, 54" span. By Larry Renger. No. 9781 GREAT LAKES TRAINER $4.00 No. 678-O.T. MISS DELAW ARE $4.00 Sport scale biplane for 3-4 channels and Steve Kowalik's 1937 Junior Motors Con­ No. 2793 STORMHAWK $2.00 .19 engines, 40" span. By Bill Northrop. sistency winner. Easy to build, 7' span. Sleek, 26" low wing sport rubber ship, reminiscent of late '30's. John Morrill. No. 9782 "LIV E WIRE" TRAIN ER $4.00 No. 5781 UPTON'S BABY ACE $10.00 Famous R/C Aircraft Series, No. 2. First Exact R/C quarter-scale model of popular No. 2794 HALF-A SCALE RACERS $2.00 kit ever for R/C modeling. Hal deBolt. homebuilt parasol, 78" span. Bob Upton. Two-for-one plan with 'Little Mike' and 'Shoestring' ukies. Jim & David O'Reilly. No. 9783 R/C STEAM LAUNCH $5.50 Natural finish mahogany planked 40" OA STICK 'EM PATTERN S No. 279-O.T. S/S PUSHER/CANARD $2.00 "African Queen" type. Kilburn Adams. Complete sets of pressure sensitive patterni Single stick, 32" pusher/canard rubber provide "printed wood". . . on your stock . . ship from '33 M.A.N. By Harry Edsall. No. 9784 COBRA/KINGFISHER C/L $1.50 for selected MODEL BU ILD ER plans. Press Whip and 1 /2A powered 2-for-1 project, all patterns for ribs, bulkheads, tips, etc., on great for young beginner. Dave Kingman. proper thickness sheet balsa or plywood, No. 1791 DFH-21 $4.00 and cut 'em out! No tracing, no transferring, Smaller FAI pattern ship for .15 power no plans tearing, no inaccuracies. Just like by top Swedish flier. Bengt Lundström. No. 8781 R/C V ELIE MONOCOUPE $8.00 Light-weight 1 /4-scale for belt reduction making up your own kit with printed wood. No. 1792 MAC'S "ROBOT" $5.00 electric power, 90" span. Bob Boucher. "Stick 'em Pattern" numbers correspond to Famous R/C Aircraft Series, No. 3. First plan numbers. Order with plans and they'll published in 1951 AM. Fran McElwee. No. 8782 VEST POCKET SE5A $2.50 be mailed together . . 3rd Class. Add 654 For pulse rudder R/C, this 22" span bug per set to mail patterns 1st Class. No. 1793 LITTLE BIT $2.00 uses Cox .020 Pee Wee. By Fred Angel. Super-mini 24" stunter will fly on up to CALIFORNIA RESIDENTS ADD 6% TAX. 35' lines with Cox .010. Randy Heydon. No. 8783 "PHOENIX" C/L STUNT $3.00 Sharp looking profile C/L stunt ship for No. 1271ÍSP CURTISS-WRIGHT Jr. $3.95 No. 1794 AVIATIK D-1 $3.00 .29 to .36 engines. By Mike Parenteau. Rubber powered scale model of WW-1 No. 11731SP BIG JOHN the FIRST $5.96 biplane fighter, span 26". Bill Noonan. No. 878-O.T. .020 RECORD HOUND $2.50 No. 574-O.T.SP T-D COUPE $2.95 Classic Henry Struck design. Could dom­ No. 674-O.T.SP RED ZEPHYR $3.96 inate .020 Replica class. Dave Sweeney. No. 6741SP T R IX TER BEAM $2.95 No. 12781 GRUMMAN AG-CAT $11.50 No. 774-O.T.SP OUT Ό SIGHT $2.45 Mammoth 2-1/2" R/C scale biplane, for No. 7781 "LIL QUICKIE" $5.00 No. 7741SPCURTISS A/12 SHRIKE $3.95 2" engines. Span 7.5’. Floyd Fitzgerald. No. 874-O.T.SP POWERHOUSE $3.95 f R/C Form I model of George Owl's best. All wood construction. By Hal deBolt. No. 91074-O.T.SP BUHL PUP $4.95 No. 12782 COUPE DE PLASTIQUE $2.50 No. 1174-O.T.SP LANZO STICK $1.95 A proven contest winner with tube fuse­ No. 11743 SP "C-OUELL" $3.95 lage and plastic propl Harry Steinmetz. No. 7782 '30's SPORTSTER $3.00 Small R/C parasol for .020and mini-mul­ No. 575-O.T. SP M ERCURY $3.96 No. 775-O.T. SP BOMBSHE LL $3.25 No. 1278-O.T. THE "TRIA N G LE" $2.50 ti or pulse rudder. Span 29". Tom Houle. Rare Antique designed by Ehling. Used No. 277-O.T. SP B ERLIN ER JOYCE $6.25 O&R 23, 1/2A with R/C. B. Shulman. No. 7783 GREAT SPECKLED BIRD $2.50 No. 3771 SP WACO UPF-7 $5.50 Unlimited rubber ship which won Mulvi- No. 4771 SP "MISS ARPIEM" $3.25 hill trophy at '77 Nats. George Perryman. No. 577-O.T. SP GLADIATOR $4.75 No. 11781 T R A V EL AIR D40 $7.50 Accurate 2-inch R/C scale model of fam­ No. 7784 "SICKLE" $2.00 ous Golden Era biplane. By Bill Seidler. Price includes 3rd Class postage and reprint FAI Combat ship with interesting mass of building instructions (if any). Add 654 production innovations. By Steve Fauble. No. 11782 PAZMANY PL-4A $4.00 PER PLAN for 1st Class postage. Add 504 Jumbo rubber scale modelof VW power­ PER PLAN for overseas orders (except APO No. 778-O.T. CURTISS ROBIN $5.00 ed homebuilt, 56" span. Leon Bennett. and FPO). Complete plans list 354. A 1937 Sport Scale ship! From Comet kit, 72" span. Designed by Joe Konefes. CALIFORNIA RESIDENTS ADD 6% TAX. No. 10781 GUSSETS $5.00 MODEL BUILDER PLANS SERVICE Sporty, mid-wing, aerobatic "could-be" No. 6781 LOCKHEED P-38L $10.00 621 WEST NINETEENTH ST. R/C scale, for .29 - .35's. Brad Shepherd. R/C Sport Scale, balsa and ply const., a COSTA MESA, CALIFORNIA 92627 trophy winner, big, 8' span. Art Johnson.

within our hobby who seem to have an on the international scene today. in a sea of high pressure, hardnosed 'outsider’s'perspective. They view "H e’d wandered over to see what all modeling business promotion and end­ modeling as a deadly serious business; the giggling was about . . . and he’d less politics . . . which smacks more of and damn the out-of-the-step individ­ come from another world. There’s no going to the job, than enjoying a hobby. uals. Politics is a main source of activity, time for lighthearted foolishness in the “ So maybe it’s a good idea to now and industry voices powerful influence, and Pro ranks of big time modeling these again review our personal objectives organizationally, costs and head counts days. Yet here was a cat among the and goals in modeling. And, if they show (body counts?) must be big, Big, BIGGER! pigeons. A rank of guys running their poor alignment with the movement of "However, it seems we’re not alone in hobby . . . instead of the other way the Herd, is that really bad? our confusion. On the field the other around. “ Following one’s personal path in day, Bill Stroman (a top Coast scale "Bill says the Pro was fascinated, and pursuit of this romance with modeling modeler) told a story from a recent Nats. walked away enlightened and intending can be a long and interesting journey. As Bill and a group of fellow scalers were to try this aspect himself. . . as a just-for- And if the Herd queries your motives? having a ball with their Peanut scales fun hobby. Tell ’em something else they won’t over in a quiet corner of the field, they “ Us OTers could tell similar stories. comprehend . . . just for the hell of were approached by a modeling cele­ Former ‘mainstream’ modelers joining it. .." · brity who's one of the top scale RC’ers our ranks because it was an island of fun 128 MODEL BUILDER ANNOUNCING ! MODELS BUILDER FIFTH ANNUAL INTERNATIONAL Parcel Post Proxy Peanut RUBBER SCALE CONTEST!

• v© SPECIAL EVEMT SS* · HI Every peanut model, from near or far, will be This year's contest w ill feature a one-design event, proxy flown, indoors, by some of the U.S.A.'s best for Walt Mooney's easy-to-build and fly De Havi Il­ rubber scale flyers, including Walt Mooney, Bill and DH-6 (Jan. '74 MB). For this event only, no Hannan, Clarence Mather, Bob Peck, Fernando documentation will be required! Static judging will Ramos, Bill Warner, and many others. be based only on workmanship and fidelity to Local modelers will be allowed to enter, but Mooney's plans, a FR EE copy of which will be in­ their planes must also be proxy flown, and no verbal cluded with your contest papers. That's right . . . or physical help will be allowed from the owner. . . put any color and markings on your DH-6 entry only written instructions to the proxy flier, as that you wish. Same model cannot be entered in allowed for all entries. la, the regular World War / category. S.______JĚÍ Open to modelers from all parts of the world... any nationality... any age... any sex... come one,come all!

AWARDS to include TROPHIES and MERCHANDISE . . . ALSO, a KRAFT RADIO SYSTEM to the GRAND PEANUT of 1979! (HIGHEST OVERALL COMBINED STATIC AND FLIGHT SCORE) PRIZES FOR THE SPECIAL ONE-DESIGN EVENT INCLUDE A RADIO SYSTEM FOR FIRST PLACE OVERALL, PLUS PRIZES FOR BEST WORKMANSHIP AND BEST FLIGHT TIME. Other prizes include such items as; Peanut Scale kits and materials, electric and glow powered engines, CO2 engines. Uber Skiver knives and sets, T-Shirts, and much more!!

Contest Director: CARL HATRAK Chief Static Judge: RUSS BA RR ER A Competition will be divided into five (5) classes: Pioneer. Scoring will be based on the total of each entry's static World War /, Golden Age, World War II, and Modern. There scale points (100 maximum) and flight points (100 max- will also be individual awards such as; most distant entry, mum). Static judging will be according to AMA Indoor best shipping container, entry most damaged in shipping Rubber Scale rules. Flight points will be the average o f the (Don't try hard for that one!), best entry built from Walt two best flights out of four official flights (10 seconds Mooney plans, best model by a female, best entry by any minimum, 100 seconds maximum). Ties will be broken by modeler under 15 years of age, oldest qualifying contestant, highest single score, or a fly-off. Number of attempts to be youngest qualifying contestant, best biplane (Big John limited, subject to size of total entry. DO NOT SEND UN­ Award!), best entry built from a Peck-Polymers kit, longest TESTED MODELS! A three-man ju ry will preside over all flight, most static points, plus a few surprises. decisions. SCHEDULE: Register by mail on or before February 1,1979 Models to be on hand on or before April 1, 1979 Contest to be held approximately April 15 to May 1,1979 Send in now for your registration form, which includes an entry blank, a complete set of rules, and other particulars. Write to: MODEL BUILDER PROXY PEANUT CONTEST 621 West Nineteenth St., Costa Mesa, California 92627 USA FROM THE SIG MAILBAG Top Left: Pretty Kathy Longar proudly displays her father Jim's Smith Miniplane. Jim told us. “I have been building and flying RC airplanes for 5 years, but I have purposely avoided biplanes because of the difficulties involved. Thanks to the Miniplane that is no longer the case. . . . my ap­ preciation for it grows with every flight. . . . an outstanding RC kit!” Top Right: M.A.N. Field & Bench writer Richard Uravitch found out that the Sig Colt is “a fun little airplane. . . . Although 1 am deeply involved in scale, I found the Colt to be a delightful diversion. . . . it is now serving as my wife’s means of flight training and she is progressing rather well.” Left, Upper: This excellent Sig Liberty Sport was constructed by Don Tread­ way of Houston, Texas. Shows top-notch craftsmanship. Left, Lower: Ralph Bruner (Bruner’s Hobby Center; Butler, PA) put ply­ wood “I” struts, different wheel pants, and a 1930’s-style military paint scheme on his second Smith Miniplane and created a distinctive new look. Ralph uses an ST-56 for power and says in his letter that both of his Smith Miniplanes have flown "superb”. Bottom Left: A Sig Skybolt built by Keith Douglas of Waycross, Georgia. Bottom Right: Dick Scrogin (Hutchinson, KS) built this highly-detailed Ryan STA for CL Scale. Powered by a Fox Eagle 60, it weighs 8-1/2 pounds.

FLY ONE OF THESE FLIGHT-PROVEN FAVORITES!

RC-27 RYAN S T A ...... 879.95 RC-33 LIBERTY SPORT ...... 872.50 RC-34 SKYBOLT...... 869.95 RC-38 SMITH MINIPLANE...... 54.95 RC-43 CO LT...... 822.95

PLACE YOUR ORDER NOW FOR SIG'S LATEST COMPLETE CATALOG - $2.00 PPD. SIG MANUFACTURING CO., INC... Montezuma, Iowa 50171 IN THE BEST CIRCLES, IT’S Uber skiver

A PRECISION INSTRUMENT FOR THE DISCRIMINATING MODELER

Safe, Rear Draw-Bar Clutch Available in seven satin anodized handle colors: Precision, Instrument-Quality Materials silver, blue, red, green, gold, copper, violet. Complete set in fitted hardwood case: includes Strong-Holding Advanced Collet Design uber Skiver, together with two vials containing Non-Rolling Hex Cross-Section four No. 11, and one each of Nos. 10, 12, 15, and 2 0 ...... Si 4.95 Deeply Knurled, Non-Slip Grip Individual handles (specify color) S5.95 Long-Life, Stainless, Vial of 6 blades (No. 10, 11, or 15) $2.10 Surgical Steel Blades (No. 12or20l S3.30 20

See your dealer, or order direct. Dealer inquiries are invited. PRODUCTSi All direct orders sent postpaid in U.S. MODEL BUILDkirt California residents add 6% sales tax. 621 West Nineteenth St., Costa Mesa, California 92627 ί

a g t o f f t * w >m>· · ·

WITH MRC-TAMIYÄS XR311R/C CAR λ... IT’S AN ALL TERRAIN VEHICLE

Like its full size brother the FMC cal obstacles up to 2". and take on a across-the-street. MRC-Tamiya's XR311, built for duty with the armed 45° incline with ease. XR311 is aggressive and built for the forces, this MRC-Tamiya 1/12 scale PRECISION ENGINEERED FOR road. Extraordinarily engineered fea­ replica was engineered to offer high THE HOBBYIST tures include proportional steering; a performance capability on-and-off Nothing has been overlooked in its 540 Mabuchi high power motor; two the road. It extends the mobility of design. A sealed transmission keeps forward and two reverse speeds; eas­ R/C wheeled vehicles into areas dust and grime off the gears. Run it in ily adjustable gear ratios 9.3 to 1; normally the province of tracked your yard, driveway, cross country or 16.1 to 1; 21 to 1; semi-pneumatic units, opening a whole new area of tires; posi rear end for sure grip; rug- challenge for the R/C car enthusiast. ed ABS plastic body; long lasting Unlike toy-type R/C cars, you'll derive §elrin gears. It gives you everything, a good deal of satisfaction from as­ power, control and reliability ... on sembling this precision kit... and in and off the road. doing so you'll be able to understand See it at your hobby dealer. It’s the it, service it when needed and enjoy it most versatile R/C vehicle ever made. as a hobby . .. because a toy it cer­ Accommodates dry cells or rechargeable nickel tainly is not. Actual torsion bar suspension system along with cadmium battenes. MRC two channel radio recom­ INCLINED TO BE operating, independent wishbone suspension on mended, although any comparable two channel INDEPENDENT each wheel help you run on uneven terrain. radio is sufficient. Radio and batteries not included Once assembled the superb en­ gineering becomes evident. You'll find actual torsion bar suspension which stabilizes all four wheels for taking on rough road environments. Operating, double wishbone, inde­ MODEL RECTIFIER CORPORATION pendent suspension on each wheel 2500 Woodbridge Avenue. Edison. N J 08817 allows it to move quickly, over punish­ In Canada 3440 Pharmacy Avenue. ing, uneven terrain. It can climb verti­ Scarborough Ontario. Canada M1W2P8